Good listing, but some mistakes (IMO). Luther is NOT tier D. He is a better tank than Chaba, and should be probably B tier. Mojo is also questionable for D tier. Astaraoth is NOT the best tank in the game, and Galahad is a better tank than Astaroth. A well developed Galahad can beat Cleaver, and be one of the best tanks in the game. Kai is also questionable on B tier. Yes, good partnership with K'arkh, but alone Kai is pretty weak. Last point, I think Astaroth and Kiera fall into the same category, they are good early on, and respond well with resources early on, and provide a lot of "easy" power that carries well through mid game, but late game, not as powerful for the investment of resources.