from Monster Musume: Everyday Life with Monster Girls
Suu (スー, Sū) is a Slime Girl that snuck into Kurusu's house without notice while looking for sources of water. She is the fourth girl to move in with him, albeit unofficially. Prior to her appearance Slimes were still considered fictional creatures by humans and, thanks to Ms. Smith not wanting to bother, are still thought of that way outside of the people she interacts with. At first glance, Suu seems to be a childish and simple-minded individual. She has a rather innocent, happy and sunny disposition and seems to be pretty friendly. While she does not have a malicious personality, her apparent obliviousness to the world around her can cause her to sometimes endanger people's lives by accidentally suffocating them with her own body. Because of their similar personalities, Suu gets along very well with Papi, and they are frequently seen playing together. Suu appears to be quite impressed by the protective concern Papi has shown towards her, and seems to have chosen her friend as a role model. Suu's main method of learning seems to be through mimicking the actions of others; such as Miia, Cerea, and Papi. It initially seemed like Suu was unable to talk, and the only things she said were phrases mimicked from others. Kimihito theorized that mimicking was how Suu communicated. (Height, Weight, and B-W-H depend on to amount of water that she's absorbed.)

Monster Musume: Everyday Life with Monster Girls
With his parents abroad, Kimihito Kurusu lived a quiet, unremarkable life alone until monster girls came crowding in! This alternate reality presents cutting-edge Japan, the first country to promote the integration of non-human species into society. After the incompetence of interspecies exchange coordinator Agent Smith leaves Kimihito as the homestay caretaker of a Lamia named Miia, the newly-minted "Darling" quickly attracts girls of various breeds, resulting in an ever-growing harem flush with eroticism and attraction. Unfortunately for him and the ladies, sexual interactions between species is forbidden by the Interspecies Exchange Act! The only loophole is through an experimental marriage provision. Kimihito's life becomes fraught with an abundance of creature-specific caveats and sensitive interspecies law as the passionate, affectionate, and lusty women hound his every move, seeking his romantic and sexual affections. With new species often appearing and events materializing out of thin air, where Kimihito and his harem go is anyone's guess! [Written by MAL Rewrite]