That staccato rhythm will be crucial to Curry’s next Pennywise role. The most remarkable thing about Curry’s Pennywise is how the actor manages to sound so much like himself. Dancing Clown has a harsh New York accent, quite unlike Curry’s British accent, and the laugh is harsher than Curry’s usual chuckle.
When Pennywise, Curry pauses so that individual words have greater impact. Make his lethal declaration to Georgie (Tony Dakota), “Get down here… You’ll… Float… Same!”, or his threats to the Losers Club , “I’m all… you’ve ever been… scared!” For the words themselves, Curry draws them, especially the vowels. Whenever Pennywise promises his prey they will float, Curry pronounces it “floooaaatt.” Pennywise is enjoying his job and Curry is enjoying his job.
Since Curry relies heavily on his voice, it’s no surprise that he’s turned out to be an excellent voice actor. In the voice of Curry, he samples from the same bag of tricks he used as Pennywise. As Ben Ravencroft in “Scooby-Doo! And The Witch’s Ghost”, Curry was initially subdued. However, once the character reveals his villainous nature, his theatrical side (and British accent) will reassert himself. When Ben casts magic and casts evil spells, Curry pulls out his vowels and emphasizes (“That makes me a waaaarloooock“). Dark Lord of the Sith, he lowered his voice an octave and put his hand in the back of his throat to distribute the sound.
When an actor is as expressive as Tim Curry, hiding his natural features can enhance his performance rather than constrict them.
https://www.slashfilm.com/991261/tim-curry-sees-movie-makeup-as-an-excuse-to-fully-let-loose/ Tim Curry Sees Movie Makeup as an apology to be completely loose