Name: Demolisher, or PTE (Pyrotechnics Expert)
This frontline unit has an explosive personality and loves all things explodey. He uses crates of fireworks to deal explosive AoE damage from afar. He doesn't do self damage, but his fireworks can hurt his allies.
He fights for purpose! He wants to beat this apocalypse to help survivors find their passion in life.
Medium health but high resistance to Drones.
Edit: To clarify, I want this unit to stay independent in a sense from the rest of the group. If he doesn't do self damage, he'll be able to hold off the Horde by being in the front line. His low rate of fire would keep him from being OP, but it would change how the game is played at all levels. The current "zombie meta" is to have all units grouped up, so the Drones act as a meat shield. If the AoE can reach them, they'll have to focus him to keep their undead ranks infecting.
Edit 2 (15 words): This pyromaniac launches fireworks that don't harm him, but may harm allies. Kaboom!