I think that elven cat character should use Awakened creature
template. As its WotC made, so its more inline with rest of the rules, and not home brew. Only problem with it, is randomized Intelligence (3d6) and increased Charisma (+1d3) over the base creature. And then add the charcter levels (in cats case, it would be base HD 1 (+2 from template) +1 character level (of choosen class)Awakened Cat
Size/Type: Tiny magical beast
Hit Dice: 3 (d8)
Speed: 30 ft. (6 squares)
Armor Class: 14 (+2 size, +2 Dex), touch 14, flat-footed 12
Base Attack/Grapple: +2/-10
Attack: Claw +6 melee (1d2-4)
Full Attack: 2 claws +6 melee (1d2-4) and bite +1 melee (1d3-4)
Space/Reach: 2½ ft./0 ft.
Special Attacks: —
Special Qualities: Low-light vision, scent
Saves: Fort +3, Ref +5, Will +2
Abilities: Str 3, Dex 15, Con 10, Int (3d6), Wis 12, Cha 7+1d3
Skills: Balance +10, Climb +6, Hide +16*, Jump +10,Listen +3, Move Silently +8, Spot +3
Feats: Stealthy, Weapon Finesse
+ additional skillpoints form intellicenge (2+Int per HD)
+ 1 level of character class.
Solid super pet. And I dont have anything against awakened creature character, as long as its animal, not an animorph...
(and if your set on Monk, that cat rally would lay some whoop ass with 1 monk level... increased saves, flurry of blows and 1st lv feat (Pounce, allowing full attack on charge, availlable for feline beasts), monk bonus feat to stunning Fist ..and voila.. super cat/monk protector