I'll name a few actresses who look like natural ticklers to me regardless of their roles in any movies. There are MANY that seem like playful ticklers to me otherwise, but some favorites of mine:
Jennifer Tilly - her appearance and expressions scream "playful tickler" to me. I'd say she would enjoy it a lot with taunting
Margot Robbie - she looks very kinky to me and would make a fun tickling, perhaps would call some of her friends to join her from time to time
Melinda Clarke as Amanda from Nikita - she is sadistic in a true meaning of that word, a real gang tickler in my mind. I don't think facing her tickle torture would be enjoyable, she seems as if she wants tickling to be a TORTURE. She would use some tight and detailed bondage to display power and dominance and would also immensely enjoy humiliation and mind games. And, of course, she would call at least 4 or more assistants to aid her every single time.
Lana Parrilla - She looks merciless. She could be playful, teasing, taunting, but also have potential of being really cruel and serious. I do think she could make tickling to be very intense if she wanted to
Marisa Tomei - just look at that face. If that is not someone who enjoys good tickling, then I don't know who is
Monica Bellucci from Matrix - she always had that specific glare I associate with tickling. I view her as effective rib tickler who enjoys watching victim in the eyes, the kind of look where you know you are at her mercy
Katey Sagal as Peggy Bundy - playful, taunting... more taunting... are you ticklish? When I saw her, I immediately thought "tickler"
Ryu Ji Hye - I can't help it, many asian ladies look like gang ticklers to me. Ryu (and several like her) are close to the type of ticklers we have in some stories, unrealistic stories with so many ticklers you just know it can't be done in reality. I'm sure Ryu and her friends might out of pure fun try to swarm the victim with tickling hands, as many as possible. I would enjoy to try have some ridiculous amount of ticklers have a go at me with feather irritations just to see would I go crazy.