Teddy is the leader of the notorious Bla Bla Gang although he isn't a bad person at heart.
Teddy is the 4th and final person to join Ninten's party, he is the 2nd most strongest character he is as equally powerful as Pippi, but she gets first place for being the first one to join.
Teddy lost his parents from the dangers of Mt. Itoi so he wants revenge. When you defeat him he joins you on your way to Mt. Itoi, replacing Loid in every single way including the items he has, he takes with him all of Loid's items although he won't use his weapons he'll use swords like the one from the Dragon in Magicant.
He'll get seriously Injured and leave the party soon and Loid will rejoin you.