Due to the number of characters, this does happen a lot:
- Japanese version:
- Ayane Sakura voices Ochaco Uraraka and Reiko Yanagi.
- Eri Kitamura voices Mina Ashido and Tenya Iida's mother.
- Masamichi Kitada voices Kamui Woods and Tensei Ida.
- Kaori Nazuka voices Mount Lady and Toru Hagakure.
- Shinnosuke Ogami voices Death Arms and Tiger.
- Kei Shindō voices Kyoka Jiro, young Shoto Todoroki, Fuyumi Todoroki and Kinoko Komori.
- Tsuguo Mogami has voiced the USJ Nomu, Mr. Compress, Hood and Crust.
- Kiyotaka Furushima voices Hanta Sero, Mustard and Togaru Kamakiri.
- Akeno Watanabe voices Midnight, young Izuku Midoriya and Mika Jiro.
- Takahiro Fujiwara voices Kurogiri and Fourth Kind.
- KENN voices Native and Toya Setsuno.
- Ayano Shibuya voices the Leader Boy and Bibimi Kenranzaki.
- Yasuhiro Mamiya voices Mimic and Gigantomachia.
- Go Inoue provided voices for both Hero Killer Stain and newscaster Daikaku Miyagi.
- Jun'ichi Suwabe has played both Shota Aizawa and Jurota Shishida.
- Masakazu Nishida voices Mezo Shoji, Ectoplasm, Kosei Tsuburaba and Sen Kaibara.
- Kōhei Amasaki provides voices for both Neito Monoma and Shihai Kuroiro.
- Kaito Ishikawa has portrayed both Tenya Ida and Manga Fukidashi.
- Aoi Yūki voices Tsuyu Asui, Pony Tsunotori and Setsuna Tokage.
- Kenta Okuma voices Cementoss, Manual, Centipeder and Nirengeki Shoda.
- Rabbit Hero Mirko and the HPSC President are both voiced by Sayaka Kinoshita.
- English version:
- Luci Christian voices Ochaco Uraraka and Recovery Girl (starting in Season 2).
- Justin Cook voices Eijiro Kirishima and the USJ Nomu.
- Mike McFarland voices Mashirao Ojiro and Ectoplasm.
- Cris George voices Death Arms, Rikido Sato and Gigantomachia.
- David Wald voices Snipe and Tetsutetsu Tetsutetsu.
- Daman Mills voices Mustard, Moonfish, the Chainsaw Nomu and Hood.
- Jeremy Inman voices the Sludge Villain and Magne.
- Kate Oxley voices young Katsuki Bakugo and Fuyumi Todoroki.
- Emily Neves voices Sirius and Eri.
- Jerry Jewell voices Principal Nezu and Kesagiri Man.
- Matt Shipman voices Sen Kaibara, Inasa Yoarashi, Mr. Brave and Takeshita.
- Chris Guerrero voiced Kenji Tsuragamae and Rikiya Katsukame.
- Bryan Massey voices Kyotoku Jiro and Crimson Riot.
- Ricco Fajardo voices both Mirio Togata and his father.
- Caitlin Glass voices Mina Ashido and young Overhaul.
- John Burgmeier voices Edge Shot and Shin Nemoto.
- Madeleine Morris voices Yui Kodai and Komari Ikoma.
- Zeno Robinson voices both Deidoro Sakaki and Hawks.
- Katelyn Barr voices Mika Jiro, Ryukyu and Gentle's mother.
- Larry Brantley voices Spinner and Crust.
- Monica Rial voices Tsuyu, young Taneo Tokuda and one of Ryukyu's sidekicks.
- Kyle Igneczi voices the Blade Villain and a pilot.
- Dave Trosko voices Present Mic (starting in Season 2) and Needle Meta Liberation Army Warrior.
- Anthony Bowling voices Rin Hiryu, Chronostasis and Skeptic (starting in Season 6).
- Stephen Fu voices Seiji Shishikura and All For One's brother.
- Anastasia Muñoz voices Uwabami and Tomie Takami.
- Brianna Roberts voices Himiko Toga's mother and the Ordinary Woman.
