Grok, Deleb, Marbas, and my favorite character, Agrail. Reducing initiative by 20-40 is very useful, as it reduces their turn order. For example: I had 2 Devils, and suddenly I see a black dragon on the opponent's side (only 1, but 1 hit, and both Devils are gone, the enemy really boosted the dragon's damage). I look at when it will move and...miraculously, the reduction works, now I can shoot it down with succubi (I have 3 squads, each with 50 succubi). Now I will always choose him.

Added 3 minutes later

Sauron. Without a walking animation.

And also without an attack animation, he just puts the sword in the air and attacks. The logic...