Mike , being born in the kanto region , became a demon slayer after his brother steven was turned into a demon. he travels with steven who is in a small box around kanto looking to improve his skills in water breathing sword techniques . all while finding a way to cure his brother. 
he is very kind and often tries to solve situations without conflict but will resort to violence if needed. he also like to flirt jokingly , but may catch feelings in the process.  