One of the main characters. Bio is quoted from https://www.mane6.com/characters/oleander/

Oleander, the great-granddaughter of Divine Oracle Amaryllis, sensed the return of Predator-kind 13 years before the first actual sighting. Her masters in the Order of the Horn saw no need to take action, as always, urging her to trust that the power of Light Magic would keep Foenum safe.Frustrated and desperate, she took matters upon herself. She began studying from a book of Dark Magic and eventually forged a pact with the demon trapped inside it. The evidence of her blasphemous act manifested over time as her coat began to turn a darker shade. Despite condemnation from those around her, Oleander is determined to prove that Dark Magic can be used to do good.With the aid of her demonic companion FHTNG TH§ ¿NSP§KBL? (Fred for short), Oleander may steal energy from her opponents, eventually amassing enough to temporarily loosen Fred’s bindings so he may fight alongside her. But can she really control Fred, or will she discover the reason for his imprisonment after it’s already too late…?

Quoted from the fan wiki:

Oleander can be best described as a troubled teen: she's long been known as the Order of the Horn's resident rebel. She's snarky, arrogant, and won't hesitate to directly insult her opponent, but shows a softer side for puppies and doughnuts. Oleander also cannot stand her peers' closed-minded philosophy of Light Magic prevailing over everything. She believes that Dark Magic can be used for good and is determined to prove it. Oleander cares for nothing but saving Foenum from the impending threat of the predators.

Being one of the primary roles in a mostly unpaid fandub project, Oleander's VA will be paid a flat rate of $100, plus an additional $50 for everything in the tutorial. Do your best to sound just like Alexa Kahn! Here's a video to help: https://www.youtube.com/watch?v=E-kobxBuUus (also includes Fred clips)