Essence 3 or 4 sounds good. Experienced enough to have maybe made names for ourselves.
Re ZL: Starting as Devil-Tigers. That's an interesting thought, but wouldn't that also mean starting with the Yozis already infuriated with us and gunning for us? Maybe the DT stuff can be something some of us work towards from creation if we're interested, without having achieved it yet?
No, it's a kind of tea. It's even in the name.
More seriously, I mentioned DT stuff because, one it was mentioned in the thread and two, because it's almost fully half of the signature Infernal high essence stuff. If the game does go far enough to make Ess 6 a consideration, I'll try to come up with something more impressive than just raw dice. (Although if anyone wants to tell me now that they want to make their character into Isidoros or Metagaos, say it now. I need to plan around these kinds of things. )
The real difficulty behind DTs is building your charms, as ExisD pointed out, starting out as DTs at a lower essence (I couldn't see doing it at 2, but 3 is reasonable I think) means that you can build the charms a little more organically so to speak. You'd only need to build up to Ess 3 charms at the beginning and could then create more as the game progresses and you gain essence. It also means challenges are a bit easier to manage--things can get pretty silly at Ess 6+, where you're not usually fighting or adventuring so much as reshaping whole swathes of creation/underworld/malfeas to fit your vision of things.
The Yozis could be angry with them, though it's possible they don't fully understand what they're becoming either and think they still have a hold over them to some degree. You could end up being the superstars of the Infernals (not necessarily a good thing), or you could be on the run from Hell AND the Realm AND the Sidereals AND... you get the idea.
I'm not trying to advocate it or anything, and I've never done anything this way before so I don't really have any experience with how it might work out, just pointing out some options.