Crosteau is highly protective with nature (especially the ocean), and he is the self-titled "Lord of the Sea". He is arrogant and cocky about his business and machines. During battle, his speech is almost poetic in manner, as he describes the battle as a documentary. He later recognizes that he was being used and apologizes to Crypto for condemning his species.
Henri Crosteau is one of the antagonists of Path of the Furon. In 1971, Henri Crousteau discovered a crashed Furon ship at the bottom of the ocean and went from fish hugger to billionaire CEO of a major corporation overnight. Founded in Belleville, his Francodyne enterprise is responsible for the mass-production of Nexosporidium Warriors. In his first appearance at his Chateau, he is questioned by Crypto and Pox, but he escapes. Later, he develops a giant shield to protect his last (and most important) factory, only to end in failure again.His final appearance is where he fights Crypto at the Belleville Tower in a giant squid-like robot, made of Nexo technology. It can shoot missiles and harness electricity.
He is defeated by Crypto, but before dying, he reveals the synthetic Furon DNA used for creating the Nexos, and that a Furon ship fell on Belleville with the product on it. His final words are that the true orchestrator of the plan was in Furon. He dies shortly after, due to falling from a great height when defeated.
- His name is a play on the famous oceanographer Jacques Crosteau.