Omega's only goals in life are to take revenge on Dr. Eggman for wasting his potential and destroy the doctor's other robots to prove himself superior. These two goals are absolute above all else in Omega's eyes. As a result, he tends to be extremely headstrong, reckless, aggressive, and destructive - decimating anything that gets in his way. Most noticeably, before the start of the War to Take Back the Planet, he performed what was supposed to be a recon mission on Eggman's base and rather than sneaking in to get info, he stormed in guns blazing in an effort to purge the base of every robot within, despite his orders having nothing to do with extermination.

I'm looking for the Sonic Heroes voice: https://www.youtube.com/watch?v=wwcUrx6775w&t=14s