voice actors O-R
Ukitake et al. on Bleach, Lloyd Asplund on Code Geass, Shobu on Duel Masters, Nanashi on MÄR, Tenma on Monster, Gaara on Naruto (and Naruto Shippuden), Maniwa on Paranoia Agent, Hiroim in Planet Hulk, Nanjiro on The Prince of Tennis, Nightcrawler, Angel, Nitro on Wolverine and the X-Men, etc.
Title character on Axe Cop; Narrator in The Gunfighter; Grandpa Mike in Hotel Transylvania 2; Metalbeard in The Lego Movie; Dr. Klorpins in a couple eps of Son of Zorn. (I've seen some of his live-action work, and someday I may move the main entry for him out of the voice actors section. But for now this is mainly how I know him.)
O'Hara, Catherine See actresses N-O
Victor's mother, Weird Girl, and gym teacher in Frankenweenie, Carlotta in A Monster in Paris, Sally and Shock in The Nightmare Before Christmas, Judith in Where the Wild Things Are, Malicious in Witch's Night Out, etc.
Belle in Beauty and the Beast (and Ralph Breaks the Internet).
Wasp on The Avengers: Earth's Mightiest Heroes, Michiru, Nel, Loly on Bleach, Jazz et al. on Danny Phantom, Mimi on Duel Masters 2.0, Yurina on Kekkaishi, Jodi et al. on The Life and Times of Juniper Lee, Ino and Konohamaru on Naruto (and Naruto Shippuden), Suzy on Zatch Bell!, etc.
Oswalt, Patton See comedians
Sockarang on Axe Cop; the title character on Happy!; Professor Dementor on Kim Possible; Quibble Pants in an ep of My Little Pony: Friendship Is Magic; Prince of Whale in an ep of Niko and the Sword of Light; Remy in Ratatouille; etc.
Overall, Park See actresses N-O
Alice Tompkins on The Critic.
Aughra in The Dark Crystal; Fozzie Bear, Miss Piggy, Sam Eagle, Animal, et al. on The Muppet Show (and movies); Bert, Grover, Cookie Monster, Harvey Kneeslapper, et al. on Sesame Street; Yoda in The Empire Strikes Back (and other Star Wars movies); the robot in Zathura; etc.
Jack on MÄR, Red on Pokemon Origins, etc.
Yakko et al. on Animaniacs, Beetle in The Ant Bully, Ditto on Ben 10, Rhomboid Vreedle et al. on Ben 10: Alien Force, Farley in Charlotte's Web 2, Jack et al. on Danny Phantom, Steelbeak on Darkwing Duck, Major Glory et al. on Dexter's Lab, Francois in an episode of Kim Possible, Eric in The Little Mermaid II, Ink Spot and Swifty in The Little Mermaid: Ariel's Beginning, Rev Runner on Loonatics Unleashed, the title character on The Mask, Pinky on Pinky & the Brain, Rude Dog on Rude Dog and the Dweebs, Raphael et al. on the old Teenage Mutant Ninja Turtles, Arthur, Brainchild, the Terror, the Evil Midnight Bomber What Bombs at Midnight, et al. on The Tick, Buck on Time Squad, Bobble in the Tinker Bell movies, and I suppose countless other things.
Hex in the Ben 10 franchise; Ripcord on G.I. Joe: Renegades; Cyborg et al. on Teen Titans and DC Super Hero Girls; Aqualad et al. on Young Justice. Also I saw him in a live-action movie, Dracula II: Ascension.
Perlman, Ron See actors N-R
Justice on Afro Samurai, Sozin on Avatar: The Last Airbender, Clayface on Batman: The Animated Series, Killer Croc and Bane on The Batman, Xibalba in The Book of Life, Mr. Lancer on Danny Phantom, title character in the Hellboy Animated movies, Orion on Justice League, Slade on Teen Titans, etc.
Pierce, David Hyde See actors N-R
Katana in an ep of Batman: The Brave and the Bold (also voiced by Kim Mai Guest), Julie and Ship in Ben 10: Alien Force & Ultimate Alien.
Emperor Zombie in The Amazing Screw-On Head, Cecil Terwilliger in at least one ep of The Simpsons, Dr. Doppler in Treasure Planet, etc.
Posehn, Brian See comedians
Cousin Larry on Kim Possible, Jim on Mission Hill, Octus on Sym-Bionic Titan, Gibbons on Tom Goes To the Mayor, etc.
Prince, Derek Stephen
Sado (Chad) on Bleach (eps 86-?), Jelly Jiggler on Bobobo-bo Bo-bobo, Diethard on Code Geass, Lordgenome on Gurren Lagann, Duke Red in Metropolis, Professor Hiragi on Mon Colle Knights, Giovanni on Pokemon Origins, Martin Zigmarl on s-CRY-ed, Takuma Zaizen on Witch Hunter Robin, etc.
Uryu on Bleach, 009 on Cyborg 009, Dr. Root on Duel Masters, Phantom on MÄR, Mondo on Mon Colle Knights, Dr. Gillen on Monster, Shino on Naruto (and Naruto Shippuden), Sanosuke on Rurouni Kenshin, etc.
Reilly, John C. See actors N-R
5 in 9, Officer Barry on Stone Quackers, the title character in Wreck-It Ralph, etc.
Richardson, Kevin Michael
Amy Yeager et al. on Case Closed, Fiore on Chrono Crusade, Lyra on Fullmetal Alchemist, Angelica on Gunslinger Girl, Kuina, Tashigi, et al. on One Piece (FUNi dub), Ai on Shin-chan, Yumi Jinnouichi in Summer Wars, Tetsuko on The Super Milk-chan Show, Muu-chan on Tactics, etc.
The Lion Turtle et al. on Avatar: The Last Airbender; the Joker on The Batman; B'wana Beast et al. on Batman: The Brave and the Bold; Lucius Fox in Batman: Gotham Knight; Carlton Duquesne in Batman: Mystery of the Batwoman; Highbreed Commander et al. on Ben 10: Alien Force; Martin Luther King, Jr. et al. on The Boondocks; Junior, Lester, et al. on The Cleveland Show; Skulker et al. on Danny Phantom; Uncle Oswidge on Dave the Barbarian; Trigon on DC Super Hero Girls; Roboto, Nasty Canasta, et al. on Duck Dodgers; Belloc in Firebreather; Roadblock et al. on G.I. Joe: Renegades; Santa Claus and the Easter Bunny in How Murray Saved Christmas; General Wells on Justice League; Captain Gantu in Lilo & Stitch; Ray-Ray and Cheeks in The Little Mermaid: Ariel's Beginning; Slam Tasmanian and Tech E. Coyote on Loonatics Unleashed; Mayor Tilton on The Mask; Glorft Commander et al. on Megas XLR; Beady Brothers in Niko and the Sword of Light; Korg in Planet Hulk; the Boogieman in an episode of Powerpuff Girls; Demongo et al. on Samurai Jack; Tombstone on The Spectacular Spider-Man; Jabba the Hutt et al. on Star Wars: The Clone Wars; Robert Hawkins on Static Shock; Nick Fury on The Super Hero Squad Show; Antauri on Super Robot Monkey Team Hyperforce Go!; Trigon, Mammoth, et al. on Teen Titans; General Aguila in TMNT; Omega Supreme on Transformers Animated; narrator of Trolls Holiday; Bishop on Wolverine and the X-Men; Panda Bubba on Xiaolin Showdown; Martian Manhunter et al. on Young Justice; etc.
Kukaku, Jinta, Kiyone, et al. on Bleach, Zola on Blue Dragon, V.V. and Inoue on Code Geass, Balsa on Moribito, Kosagi and Ryouko on Noein, Dr. Chiba in Paprika, Sakuno on The Prince of Tennis, Cattleya on Rave Master, etc.
Rodriguez, Michelle See actresses Q-R
Liz Ricarro on IGPX.
Romano, Christy Carlson See actresses Q-R
Yuffie in Final Fantasy VII: Advent Children, the title character on Kim Possible.
Root, Stephen See actors N-R
Penguin, Killer Croc, et al. on Batman: The Brave and the Bold, Mildew on DreamWorks Dragons, Bubbles in Finding Nemo, Bill and Mr. Strickland on King of the Hill, Merrimack and Doc in Rango, Chode on Tripping the Rift, etc.
Rosenbaum, Michael See actors N-R
Deadman on Batman: The Brave and the Bold, Drago on Jackie Chan Adventures, the Flash et al. on Justice League and in Justice League: Doom, Kid Flash on Teen Titans, Agent West on The Zeta Project, etc.
Rudolph, Maya See actresses Q-R
Mrs. Malocchio in The Awesomes; Aunt Cass in Big Hero 6; Rapunzel in Shrek the Third.
Rukia on Bleach, Kluke on Blue Dragon, Euphemia on Code Geass, Yoko on Gurren Lagann, Fujiko on Lupin the 3rd, Snow, Koyuki, and Loco on MÄR, Hope Stelar on MegaMan Star Force, Yuki on The Melancholy of Haruhi Suzumiya, Tsukiko on Paranoia Agent, Kizna on Pilot Candidate, Elie on Rave Master, Naomi et al. on Zatch Bell!, etc.
Prof. Rotwood on American Dragon: Jake Long; Cosmo et al. on Buzz Lightyear; the Dark Lord Chuckles the Silly Piggy, et al. on Dave the Barbarian; title character, et al. on Freakazoid!.