Vector the Crocodile is a Mobian crocodile and one of Knuckles the Echidna's oldest friends and the de-facto leader of the Chaotix. Having lived with the Guardian on Angel Island and made his acquaintance after what Knuckles thought was the death of his father Locke, Vector was the first Mobians to join Knuckles as an ally in combat. When the likes of Espio the Chameleon, Charmy Bee, and Mighty the Armadillo offered their assistance, together they formed the Chaotix. He has since remained a stalwart ally of Knuckles and later the Freedom Fighters, leading the Chaotix into battle against some of Mobius' greatest evils. Originally, this involved defending Angel Island alongside Knuckles, but has since expanded to include the war against Dr. Eggman.

Has a cannon voice. For reference, check here:

https://www.youtube.com/watch?v=fiTUwCbslYI