Suggestions by @kazkazui

Toby Wallace

as Oz in Buffy the Vampire Slayer

Score: +1

Alisha Boe

as Cordelia Chase in Buffy the Vampire Slayer

Score: +3

Dacre Montgomery

as Spike in Buffy the Vampire Slayer

Score: +5

Sean Astin

as Rupert Giles in Buffy the Vampire Slayer

Score: +1

Sophia Lillis

as Willow Rosenberg in Buffy the Vampire Slayer

Score: +18

Colin Ford

as Xander Harris in Buffy the Vampire Slayer

Score: +4

Sophie Simnett

as Buffy Summers in Buffy the Vampire Slayer

Score: +5

Sarah Baker

as Jody in ALF

Score: +1

Froy Gutierrez

as Jake Ochmonek in ALF

Score: +1

Nina Arianda

as Raquel Ochmonek in ALF

Score: +1

Leslie Grossman

as Raquel Ochmonek in ALF

Score: +1

Nina Arianda

as Raquel Ochmonek in ALF

Score: +1

Bobby Cannavale

as Trevor Ochmonek in ALF

Score: +1

Gabriel Bateman

as Brian Tanner in ALF

Score: +1

Diana Silvers

as Lynn Tanner in ALF

Score: +1

Uma Thurman

as Kate Tanner in ALF

Score: +1

Ed Helms

as Willie Tanner in ALF

Score: +3

Kathy Baker

as Mrs. Corcoran in Two Can Keep A Secret

Score: +6

Lynn Collins

as Sadie Corcoran in Two Can Keep A Secret

Score: +14

Casper Van Dien

as Peter Nilsson in Two Can Keep A Secret

Score: +16