The necrotic resist is both an adaptation of the Tiefling (which I used as a base) and something that moreso applies in the homebrew setting I intend to introduce these races in.

I suppose these races have opposite issues with fleshing out properly. Oni have a lot of powers, but I don't want the entire race to be some stat boosts and free spells. Half-Oni sorcerers/warlocks make a ton of sense and sound like a perfect fit for the race, but choosing their +1 ability and non-spell features is difficult because I don't know whether to lean them toward INT/wizards or STR/melee combat. I might have subraces just so both options are viable.

I have a clear vision for the Boarkin (strong warriors with the traits of boars), but tempering their specialization with useful features that don't make them better combatants is an issue.