Just came up with this one earlier: Ghost Pepper. He would be an attack class.
Primary Fire: Seeds that ignite after you land a couple hits (similar to when electric slide stuns someone) His rate of fire will be about the same as corn's shogun guard upgrade.
Abilities:
Possession: Take control of an AI unit for a limited time and provide powerful buffs, similar to wizard's co-star, but you play as the AI unit. This can include AI reinforcements, potted plants, and maybe even bosses? (Not sure about the bosses part XD)
Haunting aura: Ignite your supernatural talents and make the very air around you scolding- damaging enemies at a slow but steady rate.
Carolina grim reaper: Unleash your full potential and deliver a devastating beam of white hot fire. (This would probably be as powerful as crater maker, but slow to aim.
Special: When igniting enemies with haunting aura, your primary fire does more damage.
And there it is. Had a lot of other ideas of what you could do with this character, but had to narrow down my ideas. I do know we already have a plant fire class, but I was just speculating a class that is similar to the wizard's playstyle.