Except not that limited, so more like:

Good or neutral
22dex 22con 18str 19int 21wis ~22cha
Thief, warrior, ranger, bard, healer, druid (i.e. no true mages)
Quiet movement (if not even 'inherent sneak')
Small size (but not vuln blunt)
Maybe vuln water, resist... mental?

Though bonus to some bard reps and some kind of inherent steal sound ok, too