Good!
Shall we talk skills and feats then. They're ambushers, so Hide and Move Silently are obvious choices. Spot and Listen to find prey. Escape Artist also seems appropriate.
That leaves four. Picking some of a Kraken's skills seems appropriate:
Kraken: Concentration, Diplomacy, Hide, Intimidate, Knowledge (geography), Knowledge (nature), Listen, Search, Sense Motive, Spot, Survival (following tracks), Swim, Use Magic Device
They don't seem to negotiate with folk and they don't collect treasure, so Use Magic Device would seem to be out. That just leaves Intimidate, Knowledge (geography), Knowledge (nature) and Survival.
I'd suggest giving them Knowledge (the planes) instead of Knowledge (geography) since they are found all over the lower planes.
That gives us:
Sugo Skill Ranks #1: Escape Artist 17, Hide 17, Intimidate 17, Knowledge (nature) 17, Knowledge (the planes) 17, Listen 17, Spot 17, Survival 17, Swim 0
The Survival ranks seem unnecessarily high, so we could give them Knowledge (geography) and shift some points into it, but that skill doesn't feel appropriate to me.
Alternatively, we could split the Survival ranks between Search and Survival.
Sugo Skill Ranks #2: Escape Artist 17, Hide 17, Intimidate 17, Knowledge (nature) 17, Knowledge (the planes) 17, Listen 17, Search 8, Spot 17, Survival 9 (following tracks), Swim 0
I like option #2 better.
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