Joy Gremlin

A person who exudes aggressive chaotic good energy.

A joy gremlin would scheme and plot, to delight others and bring joy.

Those that do now know the gremlin, could misunderstand it's gremlin-like glee over the impending happiness it is planning to bring others.

The vibe of a joy gremlin is someone who so happy about the happiness they're about to inflict on others, that they may cackle and fidget. Mayhaps even laugh to themselves like some 2-bit villain.

Joy gremlins don't need to be in the spotlight of being "a giver" but if the spotlight is turned on them, who knows how they will react. Abashed and shy, or "HAHA! I GOT YOU! YOU'RE SMILIIIIIING!!!".

Bringing smiles about is their thing.

"...is just a joy gremlin. That's why they're cackling and fingertenting like Mr. Burns or something."