Hey guys, I started to do some character modeling for the male character in my game. I was wondering, is this method of character modeling technically legal?

Assuming you're in the US, or in a country with equivalent law of fair use, yes. The first rule of fair use law is wether you're creating something new or copying. If you're copying someone else's work verbatim, this is copyright infringement. If you're using someone else's work to help creating something new, this falls under fair use and is completely legal.