Fragments of a mysterious stone known as the Skull Stone are scattered across the globe. Once all four pieces are assembled, the location to the world's largest deposit of gold will be revealed. The villainous Doronbo Gang are searching for the Skull Stone. Standing in their way are Gan and Ai who become the masked heroes Yatterman-1 and Yatterman-2. The two are aided in their adventures by a large mechanical dog Yatterwan. 
(Source: Wikipedia)

A Japanese actor, seiyuu, and narrator. During his life, Tomiyama was affiliated with Aoni Production and Production Baobab. He died of pancreatic cancer.

Remake of the Yatterman series. A mysterious gem called the "Skull Stone" said to be able to reveal the location of the largest vein of gold in the world. This legend has entranced many people who wanted to get their hands on fame, power and wealth, including the Dorombo Gang. However, their hunt for the Skull Stone is not as easy as they imagined, mainly due to the faulty information they receive from their leader; and most of all, by a justical duo of pursuers called the "Yatterman". (Source: Anime News Network)

__Height:__ 176cm (5'9)

A Japanese actor, voice actor, singer and narrator from Shiogama, Miyagi Prefecture. He graduated from Tohoku Gakuin University's economics school and is currently affiliated with Across Entertainment.

He was the manager of the Tagajou Senior High School basketball team before he made a name for himself. His voice acting debut was the OVA [Megazone 23](https://anilist.co/anime/1935/) as the motorcycle-riding [Shinji Nakagawa](https://anilist.co/character/56633/), while his television debut was the anime [Bosco Adventure](https://anilist.co/anime/3460/) as the cowardly Otter. His break-out role, however, was in the anime [Ranma ½](https://anilist.co/anime/210/), in which he played the dual role of [Hibiki Ryoga](https://anilist.co/character/2369/) and the [Jusenkyo Guide](https://anilist.co/character/58321/). In 1991, Yamadera joined forces with [Toshihiko Seki](https://anilist.co/staff/95129/) and [Noriko Hidaka](https://anilist.co/staff/95181/) to form the acting unit Banana Fritters, which disbanded in 1995. In October 1997, Yamadera became a host on the TV Tokyo children's variety show Oha Suta. In March 2016, after almost two decades, he announced his retirement from it.

Yamadera's also known for his versatile range, as shown in the video game Danganronpa V3: Killing Harmony where he voiced all five Monokuma Kubs, including Monophanie (female). According to the Danganronpa V3 official blog, Yamadera is the first person who came to mind as "the same person voicing multiple characters at the same time". No one has as much "multiple characters" experience as him. He was able to take the individual quirks of each of the Monokuma Kubs and make all of them unique.

Other notable examples of multiple voice acting include the Kingdom Hearts series where he voiced Donald Duck, Genie (Aladdin), Sebastian (The Little Mermaid), Beast (Beauty and the Beast), Mushu (Mulan), Jaq (Cinderella) and Stitch (Lilo and Stitch), and the [Japan Animator Expo](https://anilist.co/anime/20947/) series of 35 short films where Yamadera and [Megumi Hayashibara](https://anilist.co/staff/95014/) voiced all characters.

Yamadera was married to fellow voice actresses [Mika Kanai](https://anilist.co/staff/95029/) from 1993 to 2006, and to [Rie Tanaka](https://anilist.co/staff/95060/) from 2012 to 2018. On June 14, 2021, his marriage to singer and idol Robin Shoko Okada was announced.

__Trivia:__
- His nickname is Yama-chan.
- The official dub-over voice for Eddie Murphy, Jim Carrey and Disney's Donald Duck.
- He didn't consider to do voice acting at first and was more interested in being either a live-action actor or a salesman.
- He is known as "the man with the seven-colored voice".
- In 2011 and 2017, TV Asahi conducted a poll among Japanese voice actors and actresses on "who they thought was really the most amazing person in their profession". Yamadera ranked first both times.

Gyakuten! Ippatsuman is the sixth in the Time Bokan series. In the 1990s-era Osteandel City is the headquarters of Time Lease, a business that leases almost everything you could ask for including powerful robots. They are proud of themselves for being number one in the international ranking of billionaires, for the past ten consecutive years. Meanwhile there is another lease company in the same city called Skull Lease where the notorious villain trio work as top executives. Their ostensible object is to disgrace the credit of Time Lease and replace them as the leading enterprise. In fact, however, they have a scheme to secure a footing for world conquest. One day a transport robot of Time Lease is assaulted by the villain trio and it is time for Ippatsuman to get on the move to fight for justice.
 
(Source: Anime News Network)

Throughout history, mankind's quest for power has influenced the world all the way into the future. A millennium later in the Kingdom of Calendar, two royal houses became locked in combat to determine who will become rightful heir to the throne. Each successor from the two houses sends must travel through the aeons of time and find the Cosmo Peacock. Whoever brings it back will become the rightful ruler. (Source: Time Bokan Fandom)

Set in the near future, the world is shaken by a couple of young thieves named Kiramekiman, who issue warnings before they go into action. Once they set their sights on a target, they never fail to steal it. Meanwhile, a detective trio is in pursuit of the Kiramekiman group but are unable to catch them. Secretly, the goal of Kiramekiman is actually noble, since they are only stealing certain objects in order to maintain peace in the future. (Source: Wikipedia)

Passed away on August 29th, 2011 due to stomach cancer.

The story begins in the year of 20XX. Oshaka School in Kamakuland is a prestige school of the world where only those who are pure and clearheaded descendants of Priest Sanzo's clan may be admitted. As for the familiar villain trio, they are in firm belief that they are genuine descendants of Priest Sanzo's clan although actually they are of uncertain lineage. They study hard to enter the school in spite of their repeated failure. One day three intelligent children are called in by the principal and asked by Shakyamuni dwelling in his body to find missing puzzle copperplates scattered all over the world and complete the puzzle board to heighten honor of Oshaka School. The conversation, however, is overheard by the villain trio and they decide to forestall those selected youngsters. Then they happen to meet with a brilliant boy named koochan who appears handy and so they take him with them and attempt to take away puzzle copperplates from a goblin. At the same time they try to win the goblin over to their side and attack our heroes together. Being aware of the evil scheme, Koochan transforms himself into Itadakiman and fights bravely to drive the wicked trio away. 
(Source: Official site)

Burning with ambitions to become the most beautiful woman, the most renowned scientist, and the greatest hero the world has ever known, three villains, Atasha, Sekobitchi and Duwarusuki, unite. The trio are Time Patrollers, the keepers and protectors of the annals of history. But, this is only a cover for the trio, as the villains are league with a nefarious leader, who is trying to alter the course of history to suit his desires, and, under his instructions, the trio travel in time with the aim of tampering with recorded history. Only Hikaru and Nana, disguised as the Otasukemen, stand between the villains and their goals. 
(Source: Wikipedia)

Dr Monja is a scientist who is curious about the nature of the legendary Elixir of Life which grants the drink eternal lifetimes and forever youth. He built a device called the "Time Tunnel" in order to let a team of youngsters to start a quest down the timeline and various spaces to find an exact answer. A trio of villains, however, is also seemingly after the exact same thing. 
(Source: Wikipedia)

Dr. Kieta, the inventor of a time-travel machine, is lost on a test run of his machine to the prehistoric past. When the time-space craft returns to the present, his young assistants are surprised to find only a parrot in the cockpit. In their hurry to find the missing scientist before it is too late, the youngsters set out on a time-space hunt without any clear destination. 
(Source: Official Site)

A laugh-out-loud hilarious adventure from the studio behind Battle of the Planets and Speed Racer! 
Who has what it takes to be the baddest of the bad? It's evil versus evil as teams of bad guys compete to be the meanest villains ever! Watch and laugh as the Dorombo Gang and their Kitchen Robot take on the worst of the worst in a wacky race to be the greatest villains in anime history! The only force that stands in their way are the superheroes of anime. Will the Gatchaman ninja arrive in time to save the day? 
(Source: AniDB)

Worked for 4Kids, Media Blasters, and other companies based in New York City, USA.

Two extended specials. The first one parodies Monta Mino, a famous real life Japanese entertainer. The second one parodies the US television show "24".

Narrator