The phrase "as a different character" is correct and usable in written English.
It can be used when discussing a role or persona that is distinct from one's usual self or identity.
Example: "In the play, she performed as a different character, showcasing her versatility as an actress."
Alternatives: "in another role" or "as an alternate persona".
Mr. Sheen was brought in as a different character.
The singer was due to join EastEnders in 2006 as a different character.
He later appeared in a few episodes of Ms. Eden's show, each time as a different character.
Though he would be introduced as a different character, Mr. Sheen would essentially be filling the same role on the sitcom as the fictional mayor's deputy.
"[Line of Duty] was always designed as a long-running series – something that could come back for five series with each season having a different, hopefully, kind of investigation, as well as a different character under the spotlight".
Prince Charming is Dougal Lee's David, a neighbour from over the road, while Isabelle Joss gamely plays the dame, darting in and out of the changing room and emerging freshly attired as a different character every time.
Michelle Erica Green, in her review for TrekNation, found that the voice work was distracting due to the similarity between William Shatner's and Ted Knight's voices; as well as having Nichelle Nichols voice a different character.
Though nearly as fast, Gay is a different character from Greene, the former world and Olympic 100-meter champion from the United States.
Try imagining the Story of Cinderella as told from a different character (perhaps a cockroach that she was sweeping up in Scene 1?) Edward de Bono's Thinking Hats require you to weigh up a proposal from different angles by first listing ideas within a one-minute time limit without discussion.
Each of the "Juliet" songs is presented as a letter from a different character.
The footwork has humor too: the way, for instance, the left foot will move as if it were a different character from the right.
