Suggestions by @jesselee

Tickety Tock

as Tickety Tock in Killer Grandma

Steve Burns

as Steve Burns in Killer Grandma

Mailbox (Blue's Clues)

as Mailbox in Killer Grandma

Zira

as Zira in Killer Grandma

The Penguins of Madagascar

as The Penguins of Madagascar in Killer Grandma

Mason and Phil

as Mason and Phil in Killer Grandma

Starfire (Koriand'r)

as Starfire in Killer Grandma

Zatanna Zatara

as Zatanna in Killer Grandma

Raven (Rachel Roth)

as Raven in Killer Grandma

Mr. Freeze (Dr. Victor Fries)

as Mr. Freeze in Killer Grandma

The Penguin (Oswald Cobblepot)

as The Penguin in Killer Grandma

Batman

as Batman in Killer Grandma

Harley Quinn (Dr. Harleen Quinzel)

as Harley Quinn in Killer Grandma

The Joker (Character)

as The Joker in Killer Grandma

Madame Medusa

as Madame Medusa in Killer Grandma

The Grinch (Character)

as Grinch in Killer Grandma

Green Goblin (Norman Osborn)

as Green Goblin in Killer Grandma

The Wiggles

as The Wiggles in Killer Grandma

The Crows

as The Crows in Killer Grandma

The Seven Dwarfs (Disney characters)

as The Seven Dwarfs in Killer Grandma