This is all the characters I could find that she has voice acted.There could be zaidi not on this list.....

Twilight's Voice Actress Tara Strong has done
voices including,

Hello Kitty in Hello Kitty Furry Tale Adventures,
Lemmy "Hip" Koopa and Iggy "Hop" Koopa in The Adventures of Super Mario Bros. 3 and Super Mario World (the tv shows),
Batgirl in The New Batman Adventures,
Dil Pickles from Rugrats,
Bubbles from Powerpuff Girls,
Timmy Turner, Poof, and Britney Britney from the Failry Odd Parents (I thought Timmy was obvious),
Raven from Teen Titans,
Ember McLain from Danny Phantom,
Terrence from Fosters nyumbani of Imaginary Friends,
Ben Tennyson from Ben 10 (another obvious one),
Paris Hilton in Celebrity Deathmatch (CANNOT UNTHINK!),
Meg Griffin's imba voice in Family Guy (and yet she has Rebecca Schoichet sing for Twilight, but Rebecca does such a great job!),
Truffles from Chowder,
Rikku in Final ndoto X & X-2 (such an awesome bila mpangilio fact!),
Kaede Smith from Killer7 (NO BUCKING WAY! I upendo KILLER7!),
Melody Tute in Wii muziki (...what?),
Cloe Walsh and Margaret in No zaidi Heroes 2 Desperate Struggle (another Suda51 game me gusta),
Justine from Shadows of the Damned (a lesser known game with the guy in charge of RE4, the guy who did muziki for Silent Hill, and Suda51... it was really watered down and a big disappointment),
Harley Quinn from Batman Arkham City,
Risha (Smuggler Companion, my Smuggler is based on Scootaloo! Awesome coincidence!) and Holiday in SWTOR,
Juliet kwenzi in Lolipop Chainsaw,
Palutena from Kid Icarus: Uprising, and MUCH MUCH MORE!