I have a few.
I've only played her once but like apparently I do a good Asuka from Evangelion and it's really funny because I'm only a casual fan of that franchise.
Neo from RWBY, this is 100% for the challenge of playing a mute character. I love having to be more creative in describing pleasure, having to deal with describing breathing and facial expressions as opposed to any sounds.
And then there's anytime I get to play a character with a distinctive speaking style because then I get to do something that's more interesting by design.