Straight Cougar

Voiced in the US release by Crispin Freeman.

Age 21 - Known as Cougar Straight in the manga. His philosophy on life: the faster you do one thing, the more time you have for the next thing. Usually found carrying around a book he never seems to have time to finish, he is a laid back member of HOLY and does not seem to think twice about breaking the rules. He has problems remembering names, especially Mimori Kiryu's and Kazuma's (tending to call her "Minori" and Kazuma "Kazuya"). He had known Kazuma as a child and was the originator of the Bullet moves (Shocking First Bullet and so on) that Kazuma used for most of the early series, only he calls the last bullet Rapid-Kill Final Bullet instead of Exterminating Last Bullet. In the manga, Cougar was Kazuma's mentor, which is why they both have near-identical attacks like "Shocking First Bullet". In the anime, he and Kazuma had a brotherly relationship, similar to the one Kazuma has with Kanami.

Straight Cougar is the fastest alter user on the planet and isn't afraid to show it. Using the alter 'Radical Good Speed' allows him to transform anything into a fast moving object, to reach the speed of light, and 'shrink the world' by doing things as fast as possible. He can also increase his speed alone without any vehicle by encasing armor to his shins and feet. He is one of the most powerful alter users, capable of high-speed fighting, and can even use his alter power to upgrade his armor to completely cover his body. He too has seen the Alter Dimension, although he was initially a Native Alter who had been refined (due to this, his lifespan was apparently shortened, hence his philosophy on doing things fast so he will not miss out on life). He was thought to be fatally injured in a fight with Kyouji Mujo but appears afterwards in order to rescue all of the secondary characters left in HOLY HQ. Cougar supposedly dies in the series finale, where he is seen sitting on a lounge chair reading his book, then either passes out or drops dead. He supposedly died because of his shortened lifespan through use of his alter, due to actually being fatally injured and succumbing to death because of it, or because he was refined. Cougar's supposed death is still debated by fans today because it was never officially stated that he died. He first appeared in Episode 2.

Source: Wikipedia