Dennis has been responsible for multiple murders of people, including Dayton Taylor, Shiv took Dayton's position as the V8 (the leader of the 5-10s) and made a sophisticated gang network out of it. he is also shown to work and co-operate with the secondary antagonist of the video game, Bill Coburn, interestingly enough, while Dennis is an outright criminal, Bill used to be an FBI Member, who later became a rogue and started working under Dennis not long after.
Dennis is a bit of a stereotypical evil villain, he is obnoxious and rude and is feared by many people.
While he is very evil and feared, he is still affable in a way, because as long as people respect him and work with him, he most likely won't do anything. Though he has backstabbed people. Making him quite untrustful too.
- Along with Bill Coburn, framed Alex for killing Dayton.
- After killing Dayton, took his place as the V8
- Killed Roxanne's sister for no reason
- Attempted murder at Alex