Reflex is our mongoose hero.
The comic book term is "street level". He's not super strong, or even super fast. He can't fly or shoot lasers from his eyes.

What he can do is calculate and extrapolate the trajectory of moving objects and anticipate the outcome. This super-mathematical prowess is natural and he doesn't even know how he does it. He can't explain it, he just reacts.
Added to his mastery of several forms of martial art and it seems as though he has a form of ESP.
From the first twitch of his opponent's muscles, Reflex can mentally sort out every motion and attack that will follow-- essentially seeing the entire fight before the first punch is finished being thrown.
For defence he has metallic bands around his wrists and ankles witch allow him to check knives and even deflect bullets!