This is Hamato Yoshi AKA Splinter, A fat tiny rat man in a bathrobe who means well.

Info: Prior to His mutation, Splinter was an ordinary 40 year old man who was a martial arts teacher. In his spare time or whenever he got bored, He is a master Thief and stole for his own gain. He would also engage in his favorite halftime: Toe wrestling (Toe wrestling is just like thumb wrestling but with your big toes and opponents would always do it in a mini wrestling ring called the To-O-Wring complete with two toe-sized holes in the center). One day, He came in contact with some radioactive goo like substance which turned him into what he is today and has forgotten who he is (Everything except his likes and dislikes). Shorty after, He fell through a portal into an underground city entirely populated by humanoids and anthropomorphic animals deep under the earth. He hopes of finding a cure for himself, His memories, The truth about the past and a way back to the surface. Splinter is a mutant rat with long straight white hair styled half up in a bun, a white beard, white bushy eyebrows, short grey fur, and a short, plump figure. He also has an insane amount of chest hair. His legs are light pink and from the elbows down, his arms are also light pink. He has five fingers on each hand and four toes on each foot. He has yellow sclera, a dark pink nose and tail, and a nick on his right ear. He wears a brown yukata with yellow trim and the Hamato Clan emblem placed on it's heart. He also wears a black hair tie and walks around barefoot. He is Laid-back, Abstracted, exhibits slovenly tendencies, and is invested in pop culture. He comes off as an albeit loved, father figure. He sometimes stirs up mischief and trouble. Splinter has a hedonistic quality retained since his days as a martial arts teacher, prioritizing whatever brings him joy and he enjoys the wilder things in life. He has an immaturity streak, and acts as a shallow, impulsive man-child. Ever since his mutation, It gave the abilities of all things supernatural and elderich, Something he thinks is pretty weird but feels strangely normal.

Our story begins with a figure (Splinter) Falling out of the sky, and fall face first into a pink sand desert.