[@Banana] That concept can work, but it would keep you away from all the action and make interacting with other characters considerably difficult. Plus you'd have to define what you mean by how intelligent he is, and define exactly how his power works. If you want to go the route of a thinker, let me get you some examples of actual thinkers in the story, since it's more than just being intelligent.

[list][*] Accord - Superhuman problem-solving, intellect scales with the complexity of the problem. The more complex and difficult, the better he is at handling it.
[*] Alexandria - Perfect eidetic memory, heightened cognitive speed and planning.
[*] Dinah - Can calculate the probability of any event to an exacting degree and express it as a percentage.
[*] Number Man - Complete mastery of numbers and probabilities. Just as good at guessing your safe combination as he is at using a pencil to kill a brute by applying the perfect pressure at the perfect angle.
[*] Tattletale - Can obtain information by making connections, essentially making superlatively good guesses that build on each other. (Intuition) 
[*] Uber - Instant mastery of any one learnable skill as long as he concentrates on it. 
[*] Short-duration 360-degree X-ray vision uninhibited by shadows, walls or skin.
[*] Coil - Can simulate 2 different timelines in which he makes different choices, then chooses which one to follow while discarding the other.[/list]

All of these are Thinker powers of varying potency, and as you can see they extend far far beyond simply being intelligent. Hopefully this helps you find some inspiration.