Star vs. the Forces of Evil is an animated TV series about Star Butterfly, a princess from another dimension, and Marco Diaz of Earth, fighting monsters led by the evil Ludo (Alan Tudyk), though the greater threat is ultimately Toffee.
Season 1
- Warriors - Some were blown up by Star with mines, including the two that kidnapped Ferguson, one was presumably eaten by a magical bird, and one was sucked into a black hole. (Note: Many Warriors survived)
- Monster Arm - Killed when Star used her wand to turn him back into Marco's regular arm (although he inisted that he would return).
- Hydra - Choked to death when Star and Marco got his heads tangled in a knot
- Yarn monster - Unravelled when Miss Skullnick latched him to an unmovable post with a paperclip as he was chasing after everyone
- Unicorn - Killed when Star used the Whispering Spell to destroy her wand
- Ludo's Army (Bearicorn, Big Chicken, Deer Beard, Emmitt, Lobster Claws, Man Arm, Spikeballs, Three-Eyed Potato Baby, Frill-neck Monster, Two-headed monster, Fly monster, and other unnamed monsters) - Presumably killed when Star blew up Ludo's castle. (Though they could have escaped as Buff Frog did, they are absent from Season 2)
Season 2
- Truth or Punishments Cube - Crushed in the trash compactor
- Bat monster - Jumped down the garbage hole to avoid facing Ludo's wrath
- Bon Bon the Birthday Clown - Killed in explosion of trick candles (set 100 years before the events of the episode). Returned as a ghost
- Lekmet - Used up all his power to heal Queen Moon from Toffee weakening her, and turned to ashes
Season 3
- Glossaryck - Destroyed when Ludo burned the Book of Spells. He spends his afterlife in an unknown place.
- Unicorn (2) - Killed when Star used the Whispering Spell on the wand fragment Toffee resides in.
- Star Butterfly - Drowned in black goo which used to be magic, inside her wand, while swimming after the last fragment of magic. After death she goes to Glossaryck's afterlife until she obtains the last magic fragment and is revived.
- Toffee - Crushed by Ludo with a pillar after being severely weakened, possibly mortally wounded, by Star.