Born on August 16, 1990 in Saitama Prefecture, Japan, Kōki Uchiyama or called simply by his fans as "Ucchi", Ucchi is a Japanese voice actor who mainly voices aloof young males character with Deadpan Snarker tendencies.
He made his debut as Roxas in Kingdom Hearts II. In the 5th Annual Seiyuu Awards, he won the Best New Voice Actor award for 2011.
He often appears in anime with Miyu Irino and/or Mamoru Miyano. He also often plays the younger male to Megumi Toyoguchi's older female, also often play as a couple with Kana Hanazawa.
No relation to fellow voice actress Yumi Uchiyama.
Notable roles by Ucchi:
- Akihiro Shimazu in Orient
- Akira Fudo in DEVILMAN crybaby
- Akito Yamada in Loving Yamada at Lv999!
- Aldo in Another Eden
- Alice Color in Sunday Without God
- Banagher Links in Mobile Suit Gundam Unicorn and Super Robot Wars
- Japanese dub voice characters played by Barry Keoghan
- Druig in Eternals
- Unnamed Arkham Prisoner (The Joker) in The Batman (2022)
- Benedict Blue in Violet Evergarden
- Beyazit in Altair: A Record of Battles
- Brakka in Harvestella
- Brandish (No. 7) in Mighty No. 9
- Carpaccio Luo-Yang in Mashle: Magic and Muscles
- Clavis in Death Parade
- Click in Reverse: 1999
- Daisuke Dojima in Revisions
- Daryl Yan in Guilty Crown
- Debt Collector in Akiba Maid War
- Desast in Kamen Rider Saber
- Dio Junyou Weinberg in Buddy Complex and Super Robot Wars
- Elephas Levi in I'm the Villainess, So I'm Taming the Final Boss
- Elliot Alderson (Rami Malek) in the Japanese dub of Mr. Robot
- Erik in Dragon Quest XI
- Errol in the Japanese version of Arena of Valor
- Euden/The Prince, Nedrick/Nedeu in Dragalia Lost
- Gin in Hotarubi no Mori e
- Gladio (Gladion) in Pokémon Masters
- Goldov Auora in Rokka: Braves of the Six Flowers
- Hamaguchi in Teasing Master Takagi-san
- Harry Creighton in Hero Mask
- Japanese dub voice characters played by Harry Styles
- Hiroshi Kido in Barakamon
- Ichika Orimura in Infinite Stratos
- Idia Shroud in Twisted Wonderland
- Ikuro Hashizawa/Baoh in JoJo's Bizarre Adventure: All Star Battle
- Ikuya Kirishima in Free!
- Izumi Miyamura in Horimiya (2021)
- Jack in Metal Fight Beyblade
- Joker (his real name is Lean) in Final Fantasy Type-0
- Kagura Demuri in Aquarion Evol and Super Robot Wars Z3
- Kaito in Gleipnir
- Kaito Tenjo in Yu-Gi-Oh! ZEXAL and Yu-Gi-Oh! ARC-V
- Kaoru Amazake in Asakusa Oniyome Nikki PV
- Kei Tsukishima in Haikyuu!!
- Keita Tsuwabuki in Good Luck Girl!
- Kelvin in Black Summoner
- Kentaro Izawa in Kindaichi Case Files OVA: Kuromajutsu Satsujin Jiken-hen
- Kimimaro Yoga in [C] - The Money of Soul and Possibility Control
- Kotetsu (Cameron) in Pokémon: The Series
- Kuon Seo in Reynatis
- Lancelot in The Seven Deadly Sins
- Legato Bluesummers in Trigun Stampede
- Lest in Rune Factory 4
- Lev Leps in Irina: The Vampire Cosmonaut
- Lucifer in Blue Exorcist
- Makoto Tsukimoto in Ping Pong
- Manase Mifune in Project Noah
- Melzalgald in One-Punch Man
- Meruem in Hunter × Hunter 2011
- Midnight in Fairy Tail
- Miyuki Sagara in RDG: Red Data Girl
- Mushiki Kuga in King Propose
- Natsuki Usami in Tsuritama
- Natsuno Yuuki in Shiki
- Neku Sakuraba in The World Ends with You, Kingdom Hearts 3D [Dream Drop Distance], and the original game's sequel, NEO: The World Ends with You
- Nightcrawler (Kodi Smit-McPhee) in the Japanese dub of X-Men: Apocalypse
- Park Ilpyo in The God Of Highschool
- Philip in KAMEN RIDER: memory of heroez and Fuuto P.I. (Replacing Masaki Suda from Kamen Rider Double)
- Prince in Red Haired Snow White
- The Protagonist / "Wonder" in Persona 5: The Phantom X
- Raku Ichijou in Nisekoi
- Razor in Genshin Impact
- Rean Schwarzer and Ishmelga Rean in the Trails Series and the Nothern War anime.
- Rei Suwa in Buddy Daddies
- Rin Itoshi in Blue Lock
- Roxas and Ventus in Kingdom Hearts
- Rui in Demon Slayer: Kimetsu no Yaiba
- Ruth in The Ancient Magus' Bride
- Ruo Mori in Dance Dance Danseur
- "Ryoji Kaji" in Rebuild of Evangelion
- Ryuto Tsukishima in The Caligula Effect 2
- Saejima in The Ice Guy and His Cool Female Colleague
- Sam in the Japanese dub of The Last of Us
- Seijiro Itou in Zombie Land Saga
- Seiya Kanie in Amagi Brilliant Park
- Shion Madarame in Tokyo Revengers
- Shirou Kotomine in Fate/Apocrypha and Fate/Grand Order.
- Tristan in Fate/Grand Order.
- Shobu Kirifuda in Duel Masters (starting with VS, since Shobu is an adult now, Yumiko Kobayashi still voices his brother, Katta note and nephew, Joe note though)
- Shun Futami in Cool Doji Danshi
- Shun Uruma in Juujika no Rokunin
- Sizumu in SSSS.DYNɅZENON
- Skull, Aaron and Ellis Stamp in Granblue Fantasy
- Soma and Aldo from Is It Wrong to Try to Pick Up Girls in a Dungeon?
- Soul Eater Evans in Soul Eater
- Sui Aoi in Mission: Yozakura Family
- Susanoo in Onmyōji (2016)
- T.J. Detweiler in the Japanese dub of Recess (Wasabi Mizuta voiced him briefly in the first few episodes)
- Taiki Himekawa in Oshi no Ko
- Takahiro Oomae in Diamond no Ace
- Takashi "Shindo" Sugiyama in Run with the Wind
- Takumi Sakagami in The Anthem of the Heart
- Takt Asahina in takt op. Destiny
- Theodore Sherman/Minotaur in To the Abandoned Sacred Beasts
- Toge Inumaki in Jujutsu Kaisen
- Toi Kuji in Sarazanmai
- Tooru Takatsuki in Liar X Liar Drama CD
- Tsuyoshi "Tsuyopon" Naoe in Nijiro Days
- Tomura Shigaraki/Tenko Shimura in My Hero Academia
- Ulgar Zweig in Astra Lost in Space
- V in Devil May Cry 5
- Xue Yang in the Japanese dubs of the Grandmaster of Demonic Cultivation: Mo Dao Zu Shi animated adaptation and the live-action adaptation The Untamed
- Yogiri Takatou in My Instant Death Ability is So Overpowered...
- Yoichi Kiriki in Ao Ashi
- Yoshino Takigawa in Blast of Tempest
- Yoma Hashimoto in Thus Spoke Kishibe Rohan
- Yuri Plisetsky in Yuri!!! on Ice
- Yuu Otosaka in Charlotte
- Yuuji Yugami in Yugami-kun ni wa Tomodachi ga Inai (CM)
- Yuujirou Someya in Confession Executive Committee
- Yuuta Asaba in You and Me
- Yuuya Tanahashi in Love Lab
- Yuzuki Kurezome in NieR Re[in]carnation
- Zakuro Oshigiri in The Ones Within
- Zhuge Liang Freedom Gundam in SD Gundam World Sangoku Soketsuden and SD Gundam World Heroes
Tropes associated with him.
- Chick Magnet: Even when he doesn't star in a Harem Anime, his character usually is a target of affection for a lot of girls.
- Deadpan Snarker: A lot of his character share the same dry sense of humour.
- Jerk with a Heart of Gold: A lot of his character always seems to be a brooding loner that appears to be cold but in actuality they have a hidden heart of gold.
- Playing Against Type: Ucchi is notable for his aloof and quiet roles so it's really refreshing when we hear him as the hysterical Raku Ichijou from Nisekoi.
- Star-Making Role: Roxas and Ventus in Kingdom Hearts since that's when he started voicing as a teen. It goes further with Soul "Eater" Evans in Soul Eater since the Anime was created a few years after Kingdom Hearts II was released.
- Typecasting: While he can be quite versatile, a lot of Ucchi's roles is usually a snarky, aloof and silent loner.
- Vocal Evolution: Over the years, his voice as Roxas has changed from a real mid-teen voice to a deep broody voice.
