Which Looney Tunes character is a witch with red hair who casts spells?

The Looney Tunes witch with red hair who casts spells is Witch Hazel.

Witch Hazel was created by Chuck Jones and debuted in Bewitched Bunny, released in 1954. She is usually shown as a green-skinned, round-bodied witch with wild black hair, a crooked hat, a broom, and a magic-filled household. Her plots often combine fairy-tale menace with domestic comedy: she may welcome children warmly while secretly planning to cook or eat them.

The red-hair description comes especially from Broom-Stick Bunny (1956). In that short, Hazel accidentally drinks a beauty potion and transforms into a glamorous redhead, a visual gag associated with voice actress June Foray. That transformation is why descriptions of Hazel sometimes emphasize red hair even though her familiar witch appearance has black hair. She is also distinct from Disney’s Witch Hazel, a separate character inspired by a different cartoon tradition. The name itself is a pun on the witch-hazel shrub and its herbal remedies.