Titania is a big let-down. Great model, though.
Her central mechanic, from my perspective: spend 1 action to maybe do 2 damage, drop a scheme marker (if possible) that is maybe in a useful place. If that model is in the same place when it activates, it maybe takes 2 more damage if the opponent lets it through. She can heal via scheme marker placement, but not ones she drops herself (??????).
I find her to be terribly boring and mediocre. I struggle to justify bringing her in for this reason. If she were boring + strong or interesting + mediocre I'd feel better. Big fat F on her design.
The concept has a ton of potential, too.