Full disclosure: Hellcat is my favorite superhero, so I was always going to build my deck around utilising her, but she's proved generally effective and interesting in my games so far.
Pros: Provides wild resources, allowing for reliable activations of cards like Relentless Assault and Vision
Almost never dies from consequential damage, allowing reliable activation of cards that rely on you having allies such as #all_leadership_cards
Often allows you to thwart away 4 to 6 threat in a single turn
Can repeat combos across consecutive turns, creating a reliable engine
Cons: Low ATK makes damage lines less effective
Requires a lot of resources to be utilised to full effect
Singleton (pretty please print a tutor for allies FFG)
Overall Patsy is exactly as reliable a friend to Jen as she's always been in the comics, looping in and out of the hand to apply the thwart and damage that your hand might otherwise be unable to do.
Notable Lines and Combos: Play Hellcat - exhaust - end turn - exhaust - bounce - loop (Most basic loop, 4 thw/2atk each turn)
Play Hellcat - exhaust - bounce - Play Hellcat - exhaust - bounce/pass turn (Possible with 2-resource cards, or the reload from Split Personality)
Play Hellcat - exhaust - Get Ready - exhaust - bounce - loop (more efficient leadership version of the standard loop, utilises all avaliable hit points with only one extra lost resource)
Any above line + Inspired or Lead from the Front can make the atk version of the loop worthwhile, but should usually be saved for opportunities where you have multiple/stronger allies
Make the Call gives recursion and allows you to squeeze the value out of Patsy's last hit point before bringing her back
Rating: 11/10 best girl = best card
Comic recommendation: Patsy Walker, A.K.A. Hellcat! by Kate Leth and Brittney L. Williams