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Description
Suu (スー Sū) is a Slime, an amoeba-like creature that can change shape and color without effort, and the fourth to join the group. Her basic shape is a glob with two dark eyespots that tend to glow like cat's eyes when backlit, and with a single pseudopod on top, which she can use to read peoples' thoughts and feelings on contact.[ch. 13] Her race is a type of liminal currently not fully classified under the Accord (making her an "illegal alien"), and she enters Kimihito's home without permission or Ms. Smith's knowledge; the rest of the household take pity on her and want her to stay (mostly Papi). Ms. Smith rejects any connection with her, but leaves her in the house anyway.
It is impossible to determine her age or if gender actually applies to her. In her first appearance, she took the appearance of a young woman and mimicked the other girls' behavior in a successful attempt to show friendliness. Her size varies with her water content; when holding only a small amount of water, Suu will have the appearance of a young teenager, and will become taller and more mature looking as she takes in more water, although contact with too much water can result in the dissolution of her body's cohesion and possible death; however, a solution has been found: if Suu wears a special waterproof full-body suit, she is able to play with Papi in water.[ch. 35]
Suu usually wears a raincoat and boots (given to her by Kimihito) out of necessity—any other clothes will get soaked in slime, and all small objects will pass through her membrane skin and stay suspended in her body fluid.[ch. 9] The only time when Suu can be dangerous is when she is severely dehydrated—then she will attack anybody to gather their sweat and other fluids; this will usually end up as some kind of sexual assault on the other girls[ch. 10] (later, she learns to use these assaults for her own advantage, and her favorite assault target is Rachnera), but any "attacks" on Kimihito seem to be more affectionate rather than out of actual need for water, and ever since her nursing of him when he caught a cold Kimihito has become very fond of Suu as well.
At first she didn't speak, usually using her top tentacle to determine feelings (showing either empathic or telepathic ability), and there was some confusion about her ability to understand spoken language, but later she speaks and under the influence of toxins gets downright chatty (and even venomous).[ch. 25] While Suu remains silent or speaks on monosyllables (copying the other girls) most of the time, she has on occasion had quite lengthy and intelligent conversations with Kimihito.
Different types of water affect Suu differently: Hard water makes her super-intelligent[ch. 31] and sea water makes her super-maternal.[ch. 361]
Suu often plays with Papi, and their combined energy can leave the others completely out of breath. She and Papi are schooled by the others, on a daily basis, with a different member of the household teaching each day. They rank Rachnera first as she not only teaches well and knows a lot, but she is easy and fun to interact with. Kimihito and Mero rank second as they are simply counted as 'nice'. Centorea is ranked third due to her strict nature and Miia falls dead last due to her inept teaching methods and lack of enthusiasm combined with her own lack of knowledge. She refers to Kimihito as Master (マスター Masutā).

Meroune Lorelei (メロウヌ・ローレライ Merounu Rōrerai) or simply Mero (メロ?) is a mermaid and the fifth girl. She has pale human skin and blue eyes, her hair and tail are pink with yellow fins, and in private she tends to wear a skimpy two-piece bathing suit made of fabric that has been specially treated so it won't slide off her slippery skin.[ch. 17] She's always polite and friendly, but sometimes can be unknowingly insensitive. To move around on dry land, she needs a wheelchair. In public, she uses a long dress with hat and frilly cuffs to hide her tail, webbed hands and spiny ears, giving her a Gothic Lolita appearance. She can effortlessly blend in with the crew of a maid cafe, with a little help from Suu.[ch. 18]
She initially meets Kimihito when he saves her from crashing her runaway wheelchair; later Ms. Smith forces her on the household without bothering to ask first. Mero (whether consciously or unconsciously, it's not yet certain which) projects an aura that causes people to treat her with great respect, and has been treated like royalty at the local aquarium, where she performed with the dolphins,[ch. 19] and by Cerea, who believes her to actually be royalty. It is later revealed in Chapter 34 that Mero is indeed royalty, specifically a princess as her mother is the queen of the mermaids. Ms. Smith apparently knows about it, judging from her reaction when Mero's identity was finally exposed.
She seems to have a masochistic side, as she enjoyed Miia's cooking (despite foaming from the mouth) and doesn't mind being tied up by Rachnera. She is a great fan of Hans Christian Andersen's story "The Little Mermaid" (as, according to her, all mer-people are) and dreams about falling in all kinds of tragic love, earning her the title of "Tragedy freak" from Miia; however, when she actually falls in love with Kimihito and sees him with Miia, she realizes that tragic love actually hurts, and in Chapter 30 the hope and possibility of becoming Kimihito's bride makes her so happy that she seems to have abandoned the dream of being his mistress (although still remaining in "tragic heroine mode").[ch. 30] In Chapter 43, it is revealed that she helps supplement the Kurusu family expenses with money sent to her by her mother; she would like to get a part-time job, but her mother has forbidden it, so she helps with Papi and Suu's home-study as a teacher.[ch. 43] She refers to Kimihito as Beloved (だんな様 Danna-sama).

Description
Suu (スー Sū) is a Slime, an amoeba-like creature that can change shape and color without effort, and the fourth to join the group. Her basic shape is a glob with two dark eyespots that tend to glow like cat's eyes when backlit, and with a single pseudopod on top, which she can use to read peoples' thoughts and feelings on contact.[ch. 13] Her race is a type of liminal currently not fully classified under the Accord (making her an "illegal alien"), and she enters Kimihito's home without permission or Ms. Smith's knowledge; the rest of the household take pity on her and want her to stay (mostly Papi). Ms. Smith rejects any connection with her, but leaves her in the house anyway.
It is impossible to determine her age or if gender actually applies to her. In her first appearance, she took the appearance of a young woman and mimicked the other girls' behavior in a successful attempt to show friendliness. Her size varies with her water content; when holding only a small amount of water, Suu will have the appearance of a young teenager, and will become taller and more mature looking as she takes in more water, although contact with too much water can result in the dissolution of her body's cohesion and possible death; however, a solution has been found: if Suu wears a special waterproof full-body suit, she is able to play with Papi in water.[ch. 35]
Suu usually wears a raincoat and boots (given to her by Kimihito) out of necessity—any other clothes will get soaked in slime, and all small objects will pass through her membrane skin and stay suspended in her body fluid.[ch. 9] The only time when Suu can be dangerous is when she is severely dehydrated—then she will attack anybody to gather their sweat and other fluids; this will usually end up as some kind of sexual assault on the other girls[ch. 10] (later, she learns to use these assaults for her own advantage, and her favorite assault target is Rachnera), but any "attacks" on Kimihito seem to be more affectionate rather than out of actual need for water, and ever since her nursing of him when he caught a cold Kimihito has become very fond of Suu as well.
At first she didn't speak, usually using her top tentacle to determine feelings (showing either empathic or telepathic ability), and there was some confusion about her ability to understand spoken language, but later she speaks and under the influence of toxins gets downright chatty (and even venomous).[ch. 25] While Suu remains silent or speaks on monosyllables (copying the other girls) most of the time, she has on occasion had quite lengthy and intelligent conversations with Kimihito.
Different types of water affect Suu differently: Hard water makes her super-intelligent[ch. 31] and sea water makes her super-maternal.[ch. 361]
Suu often plays with Papi, and their combined energy can leave the others completely out of breath. She and Papi are schooled by the others, on a daily basis, with a different member of the household teaching each day. They rank Rachnera first as she not only teaches well and knows a lot, but she is easy and fun to interact with. Kimihito and Mero rank second as they are simply counted as 'nice'. Centorea is ranked third due to her strict nature and Miia falls dead last due to her inept teaching methods and lack of enthusiasm combined with her own lack of knowledge. She refers to Kimihito as Master (マスター Masutā).

Meroune Lorelei (メロウヌ・ローレライ Merounu Rōrerai) or simply Mero (メロ?) is a mermaid and the fifth girl. She has pale human skin and blue eyes, her hair and tail are pink with yellow fins, and in private she tends to wear a skimpy two-piece bathing suit made of fabric that has been specially treated so it won't slide off her slippery skin.[ch. 17] She's always polite and friendly, but sometimes can be unknowingly insensitive. To move around on dry land, she needs a wheelchair. In public, she uses a long dress with hat and frilly cuffs to hide her tail, webbed hands and spiny ears, giving her a Gothic Lolita appearance. She can effortlessly blend in with the crew of a maid cafe, with a little help from Suu.[ch. 18]
She initially meets Kimihito when he saves her from crashing her runaway wheelchair; later Ms. Smith forces her on the household without bothering to ask first. Mero (whether consciously or unconsciously, it's not yet certain which) projects an aura that causes people to treat her with great respect, and has been treated like royalty at the local aquarium, where she performed with the dolphins,[ch. 19] and by Cerea, who believes her to actually be royalty. It is later revealed in Chapter 34 that Mero is indeed royalty, specifically a princess as her mother is the queen of the mermaids. Ms. Smith apparently knows about it, judging from her reaction when Mero's identity was finally exposed.
She seems to have a masochistic side, as she enjoyed Miia's cooking (despite foaming from the mouth) and doesn't mind being tied up by Rachnera. She is a great fan of Hans Christian Andersen's story "The Little Mermaid" (as, according to her, all mer-people are) and dreams about falling in all kinds of tragic love, earning her the title of "Tragedy freak" from Miia; however, when she actually falls in love with Kimihito and sees him with Miia, she realizes that tragic love actually hurts, and in Chapter 30 the hope and possibility of becoming Kimihito's bride makes her so happy that she seems to have abandoned the dream of being his mistress (although still remaining in "tragic heroine mode").[ch. 30] In Chapter 43, it is revealed that she helps supplement the Kurusu family expenses with money sent to her by her mother; she would like to get a part-time job, but her mother has forbidden it, so she helps with Papi and Suu's home-study as a teacher.[ch. 43] She refers to Kimihito as Beloved (だんな様 Danna-sama).