The homeless man is a character in "Re:Live". He lives at the abandoned amusement park that the murder took place in and witnessed the original murder. He is a very creepy and preverted character and although he doesn't have too many lines, he does have lots of awkward laughing and breathing as well so emphasize how creepy he is.

I picture a bit lower and rougher sounding voice because he has been living on the streets for years, but I'm open to interpretations as long as the creepy factor is met.