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Celestial or Half-Celestial template applied to any cat creature.
I suggest Tibbit because they're fun, but I don't know what sort of application you're looking for (Tibbit is from Dragon Magazine Compendium).
Celestial Dire Tigers, Good Half-Celestial Rakshasas (That'd be a trip), Celestial Manticores, Half Celestial Weretigers, etc. Go nuts.
I'm primarily interested in celestials/good outsiders that aren't cats (per se), but are cat-like in appearance. So, for example, Leonal is okay, half-celestial tiger is not. I need them as ancestors for cat-like aasimars.