Suggestions by @nathanbuschmann

Sophie Turner

as Phoenix/Marvel Girl in X Men MCU

+16-26Score: -10

Jeff Goldblum

as Lex Luthor (older) in Future castings in the DC Extended Universe

+6-10Score: -4

Drake Bell

as PJ Duncan in Good Luck Charlie (2000-2004)

+3-1Score: +2

Rowan Blanchard

as Charlie Duncan in Good Luck Charlie (2000-2004)

+4-7Score: -3

Anna Kendrick

as Teddy Duncan in Good Luck Charlie (2000-2004)

+2-3Score: -1