Suggestions by @bobbyhavens

Andrew Scott

as Phil Coulson in Marvel Universe

Cole Sprouse

as Korvac in Marvel Universe

Alexander Ludwig

as Beta Ray Bill in Marvel Universe

Luke Evans

as Count Nefaria in Marvel Universe

Nicholas Crovetti

as Gretel in Black Lagoon

Izuku Midoriya

as Groot in Anime Avengers

Revy

as Drax in Anime Avengers

Evangeline A.K. Dowell

as Rocket Racoon in Anime Avengers

Riza Hawkeye

as Nebula in Anime Avengers

Puella Magi Madoka Magica

as Mantis in Anime Avengers

Mikasa Ackerman

as Gamorra in Anime Avengers

Alphonse Elric (Full Metal Alchemist: Brotherhood)

as Winter Soldier in Anime Avengers

Teru Mikami

as Ronin in Anime Avengers

Ryuk

as Ultron in Anime Avengers

Winry Rockbell

as Carol Danvers in Anime Avengers

Benny (Black Lagoon)

as Peter Quill in Anime Avengers

Saitama/One-Punch Man

as Thanos in Anime Avengers

Samurai Champloo

as Sam Wilson in Anime Avengers

Misa Amane

as Wanda Maximoff in Anime Avengers

Kagome Higurashi

as Maria Hill in Anime Avengers