Various heads of some Champion form Digimon: Werewolfmon in the top right, Menamon next to him, and a mostly unfinished Lioneermon on the bottom.

They make look similar/bland, but the reason for that is because their defining characteristics are not present. Menamon, for example, has the hindquarters of a fish-like wolf and huge rudder-like fin-wings. Lioneermon's mane goes all the way down to where his tail would be (as he doesn't have a tail) and is actually made completely of fire.

And yeah, those are some precalculus notes from 11th grade. Don'tcha love my terrible handwriting? :P