A person who is often self tempered and unreasonable. Will is the type of person who would pick a fight with anybody, and in Australia, is usually a wannabeeshay. He is the type of person who would cheat on his girlfriend (or boyfriend, he does seem suspicious) in front of their face, and be open with is, accepting it as a way as such a praise.
Mia: "Did you see Will? He picked a fight with Quince after he got confronted about cheating on his girlfriend,"
Leah: "Why is he like that?"
Mia: "I don't know, I guess he is just a Will."