So, tried a take on the ler version of this. Just one idea for the axis, most likely room for improvement.
Felicia - Certainly a sweetheart, will keep things very playful and not go overboard, just doing enough to make someone smile and giggle.
Mai - Generally a nice person, but will take advantage of someone being ticklish to get more out of them, see them calling out for it to stop as encouragement.
Sombra - Never one to go out, Sombra will use a light touch and breaking words to drain someone's defenses, keeping them on edges without ever having to push herself.
Wasp - More rough and tumble as a hero, Wasp isn't going to back off while someone hasn't given in. Once they do though, she's going to stop and comment how fun it was.
Cassie Cage - A brat without being a sadist, Cassie will tickle someone intensely, even enjoy herself with it once someone really gets laughing and she starts mouthing off at them.
Ryoko - Not one for to stop her own fun, Ryoko's going to dominate anyone she finds is ticklish and make sure they know she's in control, ramping up the embarrassment fiercely.
Ayame - A ninja, an assassin and a complete brat, Ayame's going to let her mouth do most of the work, breaking down someone while keeping the tickling relatively light. Not much fun taunting someone if they're too busy laughing to hear it.
Android 18 - More business like than the others, Android 18 is still going to destroy whoever she gets her hands on. Unlimited energy and a bit of a dark side, she'll get her victory over the ticklee.
Juri Han - Going to tickle someone to insanity and enjoy every moment of it. Juri will use anything and everything to break someone's mind and body, most likely while getting off on it too.