Starting the ISC, looking for leader

[Lemminkäinen]

From Jokers to ISC - that's probably the biggest change available in Eden

Yellow Komuso I have no first-hand experience with but on paper he looks very, very good. Not at all as killy as your other two candidates but a terrific distraction piece.

The other two I've faced, so I can maybe offers some more insight on them. Grey Kitsune has the absolutely huge ability to cancel an opposing Tactical Card. It's costly, yes, but then again ISC has a lot of SP. For example, cancelling the card that makes you reveal your secret mission can be a game changer. He is also a very good fighter.

Grey Shogun is an even better fighter but not quite as versatile. His ability to make a friend win an opposition roll has some cool applications. It combos very nicely with the Green Mamushi, for example.

I would also suggest looking into Blue Kami or Blue Rikishi. Both are very nearly indestructible, keep your other dudes healthy and allow for some fancy maneuvering - the Kami by blowing up scenery elements and Rikishi by pushing stuff around. My regular opponent has used him more to push his own models than mine and that can be very powerful in case your opponent has carefully placed his models to be out of harm's way. So even the possibility of the push may force him to place his models non-optimally.

But yeah, Carmins are good stuff. Ronin is an absolute terror and his Smokescreen is a game changer. He can be killed however (five to anywhere but torso kills him in one shot) so some care must be taken. Samurai isn't quite as devastating but definitely a scary fighter and is a bit more durable. Onryo looks extremely interesting and is cheap (though a bit fragile) and Hadakauma is fast and very powerful which sounds like a really nasty combination.