Teisel Bonne is the leader and eldest brother of the Bonne Family air pirates in the MegaMan Legends series. He is 29 years old.
Teisel has a very strong and imposing figure, always clad in a suit of green armor, but he is actually more the type to rely on intellect than strength, and he serves as the primary strategist for all the Bonne Family plans. So that no plan ever fails twice, he makes it a habit to have reviewing meetings with the rest of his team after a failure. He also pilots many of the battle machines his sister Tron creates, including the Marlwolf, Balcon Gerät, Theodore Bruno and Blitzkrieg. Besides Tron, he has a younger brother Bon.
As a leader, Teisel has fantastic enthusiasm and always dives into an operation head first with confidence. While he is constantly perplexed at being defeated, he is not the type to ever give up. He is also fairly cunning, and has pretended to give up as well as ally with foes in order to get ahead. It's also said he's never lost an argument. Curiously, it's also said that Teisel has great esteem for women, but so far has not been liked by even one woman. While he's very stern with Tron's upbringing and discipline, there are also many times when he is very sweet to her.
Teisel has a number of hobbies, including reading, watching anime, and collecting models and toys. His personal quarters on the Gesellschaft has huge bookshelves lined with everything from business manuals to manga. It's also said he's such a big anime fan that even after losing his parents, he can't miss it.
Teisel first encountered MegaMan after invading Kattelox Island demanding access to the island's ruins, and also crossed paths with MegaMan in the search for the Mother Lode, making MegaMan one of his greatest enemies, albeit an enemy he respects. Teisel was also captured and held prisoner by Lex Loath in The Misadventures of Tron Bonne for not paying back the loan he took to build the Gesellschaft.
Teisel is voiced by Rob Smith in the English game and Tesshou Genda in the Japanese game.