[Jack Simth]

Edit: All DM's are evil; it's in the handbook. Wolf chosen because that's what you were insistent on while I was typing this up....

Okay. Wolf it is.
Stats:
Let's see.... undoing your racial adjusments means +4 Str, -2 Dex, +2 Con relative to what you have currently, while adding the Wolf's racial adjustments changes things an additional +2 Str, +4 Dex, +4 Con, for a net change of +6 Str, +2 Dex, +6 Con from your current character sheet.
Hit points:
2d10 racial Magical Beast hit die add 11 HP (average), + 2*your new Con bonus per hit die, + the bonus HP from the change in Con for pre-existing HD (3*13 = 39 more HP)
BAB:
Magical beast gets full BAB, so +2 BAB.
Skills: 2+Int Mod skill points per Hit Die, class skills for those two being Hide, Listen, Move Silently, Spot, and Survival.
Feats:
Pick up Track as a racial bonus feat, and the change to a 15 HD critter means you get a feat of your choosing (also means its going to be a while before you gain another level....).
Trip (Ex): A wolf that hits with a bite attack can attempt to trip the opponent as a free action without making a touch attack or provoking an attack of opportunity. If the attempt fails, the opponent cannot react to trip the wolf.
Scent: +4 racial bonus to Survival rolls when tracking by scent
Saves:
As a Magical Beast, you get good Fort and Reflex saves for your racial HD, so you get +2 each to base Fort and Reflex relative to what you have now (as multiclassing - +2 for first HD, 1/2 for each additional, round down - 2.5 round down = 2)
Misc:
Good luck making a Disable Device check.... no hands anymore.
Your armor doesn't fit (on two counts - size and type).
You can't get in and out of your cloak without aid (although it fits perfectly, due to it's adaptive magic).
You are now ECL 15 with your previous experience points - it will be a while before you level again....
As a Magical Beast, you have Darkvision 60 feet and Low Light vision.
You will need to go through your assorted skills and update any bonuses/penalties that were due to your size (such as grapple check modifiers)
Likewise, as a quadruped, you get certain bonuses in some fairly rare circumstances (such as someone trying to trip you)
You are now eligible for Monster Feats whose prerequisits you meet.
If you like, you can also re-choose your character's gender.


Jason summons up his Spectral Hand, reads the first scroll of identify, and touches the carefully preserved oil with the hand...
And then runs, full tilt, with a panicked look on his face, deep into the forest.

20 minutes later, he runs back, full tilt, and gives the results:
"It's bottled life! We can use this to bring Kibin back! Just make sure to get him out of his armor first - we can't be totally certain of the results; the energy tasted a bit... odd. Not quite like what a cleric channels."

Derrel shrugs, removes Kibin's armor, weapons, and clothing, then pours the fluid out on the body.

Over the course of the next 10 minutes, Kibin changes and grows - he sprouts hair, grows to the size of a man, and changes to move on all fours. Afterwards, he awakens ... a full-grown wolf, and the bottle is empty.