Kevin Koss has followed in the footsteps of two generations of extraordinarily talented pilots and has been in a plane almost since he could walk. He's most comfortable in properly equipped fighters, but if it flies, not only can he pilot it, he can make it do things no other pilot can.

Ace met Gina Diggers and Cheetah when they stowed away on one of his flights when they couldn't pay for transportation. He found them on accident and decided to continue to take them where they wanted to go. As a show of gratitude, the two adventurers split the treasure they found upon reaching their destination. Ace and the Diggers have been great friends ever since.

Despite his friendship with Gina, Kevin started going out with her then-arch rival Penny Pincer.