Suggestions by @swheelhouse

Jack Dylan Grazer

as Eddie Kaspbrak (child) in It(story private)

Score: +1

Wyatt Oleff

as Stanley Uris (child) in It(story private)

Score: -1

Jeremy Ray Taylor

as Ben Hanscom (child) in It(story private)

Score: +1

Seth Green

as Richie Tozier (child) in It(story private)

Score: +1

Jonathan Brandis

as Bill Denbrough (child) in It(story private)

Score: +1

Isaiah Mustafa

as Mike Hanlon (adult) in It(story private)

Score: +1

Dennis Christopher

as Eddie Kaspbrak (adult) in It(story private)

Score: +1

James McAvoy

as Bill Denbrough (adult) in It(story private)

Score: +1