I am LIVING for this trend of supernatural idols so I desperately needed to join, I think ultimately they ended up too out-there to even remotely be LL anymore but the idol-setting still works so nicely for them I'll post them anyway, sue me (No for real this was fun, I know some people hate me posting not-canon-LL-characters but plz let me have a little fun with a fun community thing for a bit)

So I haven't made up my mind on species yet but let's call them something like sirens/emotion-vampires/demons.

The left feeds of negative feelings and any amount of discord, something that feeds her much more potently when it happens in spite of strong positive feelings (hence why she's incredibly attracted to the idol community as a food source and constantly tries to have fights start between group members in events)

The right fuels and then feeds off love, leaving a void behind basically. Naturally, in a setting that already lives by inspiring joy and love in people, she feels like her cup runneth over.

As they are fundamentally dangerous to each other's food source, they're enemies.

Edit: In the traditon of me naming my characters words that sound neat and combine well together when said they have names now: Pin (left) and Puff (right)