Artwork done by  Dark_Persian. As always, I love her work.

This is my OC Snivy, Veronica. She got chosen by a rather unusual mask at some point and it gives her quite a bit of power... and a temporary, fully-evolved form. She has a taste for high-adventure and exploration. She's got relatively little fear of fire (thanks to her father being a Quilava) and she's hard to scare away from somewhere that promises new discoveries and interesting sights. She simply loves to explore.
Though Veronica is a good individual, she can come off as a bit cold and self-centered at times... mostly because she does have a bit of self-interest behind many of her actions, which includes her desire to explore. In addition, being female, she feels she's obligated to give a portion of her attention to her appearance, thus she can be a little focused on how attractive she is. And when it comes to eating others, it's mostly to keep her energy up, as she has neither the patience nor typically the conditions to simply catch some sunlight and photosynthesize, given that she's typically wanting to- or is in the midst of- exploring some ruin.
Veronica is also willingly host to a type of bio-luminescent moss that she came across in a cave during one of her explorations. She allows the moss to grow and thrive on her back, her grass-type nature allowing it to grow on her without hindering or harming her. In-return, Veronica finds the moss immensely useful for its light-giving properties and has access to it in almost all circumstances. It's an effective, symbiotic relationship.
The Mask also gives her venom-related abilities... making her masked-form effectively Grass/Poison, rather than pure-Grass. It seems to have had an effect on the moss too. Either way, Veronica is not someone to be taken lightly.