Trevor, Michael and Franklin are pretty badass dudes. Trevor specifically is quite a crazy animal. However, for those that like to spruce up their charaters' badass-ness, GTA 5 has a few character cheats that are sure to be a good time.
In this video, you'll see cheats like lowering and raising your wanted level, explosive melee attacks, fast run, slow mo aim, explosive rounds and flaming bullets.
With these cheats you'll be taking on 5-star level pursuits, while exploding police and army vehicles with your explosive rounds, and outrunning them with fast run. Sure it might not be the crazy super-powers of Saints Row 4, but hey, it does come close.
Remember, using these cheats will disable you from gaining Achievements in the game.