Teisel is the leader of the Bonne family of air pirates, which includes his younger sister and baby brother, along with a pile of little mechanical minions called Servbots. As the mastermind of the group, he uses his extreme intelligence to come up with brilliant and exciting ways to steal treasure of all sorts. Yet beneath his rough exterior he is thoughtful and caring, particularly toward his family. His soft side also includes a love of animals and toys.

The Misadventures of Tron Bonne -

Teisel went majorly into debt to furnish his family with a grand airship and the best gear a group of air pirates could ask for. Before he's able to pay off that debt, he is taken captive by his creditor and doesn't make another appearance until late in the game.

Mega Man Legends -

Teisel has targeted Kattelox Island, where a legendary treasure is said to be buried deep within the ruins. He sends his sister Tron and his brother Bon to handle the job, but finds out by way of the Kattelox news station that the two of them were defeated by MegaMan. Bad timing on the Bonnes' part. The rivalry between Teisel and "Blue Boy" continues through the game and beyond...

Mega Man Legends 2 -

After an unsuccessful attempt to lead an honest life managing a store (having failed because Teisel only stocks things he likes), the Bonnes have returned to the pirate game, if only temporarily. They ally themselves with their former enemy Glyde and his forces in an attempt to obtain the Keys to the Mother Lode before MegaMan does.