Cleon
Legend
I guess we should do skills and feats next, but that feels a bit intimidating. Let's take a hack at the skills. I guess I'd go for max ranks to keep things simple.
Concentration, Intimidate, Knowledge (religion), Knowledge (the planes), Listen, Sense Motive, Spot, ???
Maybe Diplomacy for dealing with cultists? Any other thoughts?
Those all seem fine, which means we'll need another seven (assuming we are maxing-out the skills).
Let's consider a few Demon Lords for ideas:
Juiblex: Bluff +28, Concentration +36, Diplomacy +6, Hide +22, Intimidate +30, Knowledge (arcana) +30, Knowledge (dungeoneering) +30, Knowledge (religion) +30, Listen +30, Move Silently +26, Search +30, Sense Motive +30, Spellcraft +32, Spot +30, Swim +34
Obox-Ob: Climb +41, Concentration +42, Hide +24, Intimidate +37, Jump +47, Knowledge (arcana) +35, Knowledge (religion) +35, Knowledge (the planes) +35, Listen +36, Move Silently +32, Sense Motive +36, Spellcraft +37, Spot +36, Tumble +34
Of those, Climb, Knowledge (arcana), Knowledge (dungeoneering), Sense Motive, Spellcraft and Swim seem appropriate.
That only leaves one more. Maybe Use Magic Device?