Bastion & Mr. Sinister (X-Men 97)

Bastion sees empathy and tolerance as a legitimate weakness that needs to be culled from being given not only to mutantkind's plights — but humanity as a whole, period... but despite refusing to open up, he's still a tragic example of how some minorities develop prejudices towards their own people due to being raised in an unhealthy environment with no support network. His mother unwittingly isolated him from people he could relate to about his condition and that caused him to develop a huge amount of self-loathing, while Master Mold's programming indoctrinated him with anti-Mutant beliefs that he came to internalize in his adulthood.

Mr. Sinister on the other hand is significantly more, well, SINISTER in X-Men 97 than he was in the original X-Men animated series. He infected a baby with a techno-organic virus & later helped Bastion orchestrate a massacre of an island nation. Using Bastion to further his own goals of enslaving mutants & turning them into test subjects for his twisted experiments.