Pffshaw. Just use a Leopard with the Awakened template. As per standard quick-stat rules presented in SS, it would have modifiers of
+6 Strength, +8 Dexterity, +4 Constitution, +2 Wisdom, -4 Charisma (+1d3 due to Awakening) with Intelligence rolled as 3d6, +1 Natural Armor, Medium Size, a natural bite attack as a primary attack for 1d6 points of damage and two claw attacks as secondary, for 1d4 each, with Improved Grab, Pounce, and Rake as special attacks, with Low-Light Vision and Scent as special qualities, a base speed of forty feet, tack on their skill bonuses
Leopards have a +8 racial bonus on Jump checks and a +4 racial bonus on Hide and Move Silently checks. Leopards have a +8 racial bonus on Balance and Climb checks. A leopard can always choose to take 10 on a Climb check, even if rushed or threatened. *In areas of tall grass or heavy undergrowth, the Hide bonus improves to +8.
, three natural hit dice, and two further hit dice (due to awakening). . .
Decide the level adjustment (+1 at most, while the natural attacks are potent and all, they deal less damage than a fighter with a longsword, and thus don't particularly matter, all it really has going for it is the ability modifiers and being a kitty, throw in the 5 natural hit dice, and no hands, and +1 LA should be perfect. If you're particularly kind, let them choose 5 levels of a character class with +1 LA instead of 5 animal hit dice, which just aren't that great).
Boom, d- oh wait, you mean 4e. I dunno then.
Edit: An awakened leopard rogue or scout (since it has Pounce) would be amazing. Particularly Scout. . .