I feel like Shulk should be in "rarely kills" he has an emotional breakdown about the concept of killing a genuinely awful person and I don't think he directly kills any proper human character (or homs, or whatever). He does kill those lizard and bird people that are kind of a tribal society, but I'm not sure about those guys since they're just treated like monsters.

Mythra's a stone cold killer though, she had no regrets.

IDK about Banjo and Kazooie being in "only kills bad guys". Remember in Banjo Tooie were they just kill the ice cube couple? Both were for personal gain. Just sayin