An old friend of Hayami when he was in the Naval Academy, Kastuma was a sort of upperclassmen that worked with him on the Grampus. He went to the North Pole with Hayami on some sort of secret mission, but was attacked and rescued his friend before they were engaged by Zorndyke's fleet. He was thought to be dead, and Hayami blamed himself for it.   Years later he is found once again, the only man to have escaped from Zorndyke, but at a price. Now a half human, half aquatic mutant, he dwindles between humanity and becoming one of Zorndyke's hybrids. Despite this he still functions as a sort of living map, that the No. 6 wishes to use to bypass Zorndyke's fortress. Until then, he has been put into a metal, water-filled capsule to survive in.   (Source: Ticktank Wordpress) 

The once famous and well respected scientist Zorndyke has bred a new genre of living being, one that thrives on the oceans and lives to destroy humans. Zorndyke believes it is time that the humans were relieved of their rule of the earth. It is up to Blue Submarine No. 6 and the rest of the Blue fleet to put an end to Zorndyke's madness and creations.
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(Source: Anime News Network)
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Holds a 2nd Dan rank in Kendo. A veteran Japanese voice actor who has played characters in anime, drama CDs and video games. Apart from voice work, Toshihiko Seki sometimes does live-action drama stage work and is a member of 81 Produce.

__Non-anime roles:__
• Dottore (Genshin Impact)
• Chongyue (Arknights)

[Instagram](https://www.instagram.com/raul_schlosser/) | [Facebook](https://facebook.com/100084694849928)

Oldimar Raul Schlosser is a Brazilian actor, voice actor and dubbing director.

In 2015, Raul completely retired from the dubbing industry to deal with personal issues related to his health. He only returned to the profession in 2023, having been active since then.

__Non-Anime Roles:__
~!- Logan / Wolverine and Kurt Wagner / Nightcrawler (Wolverine and the X-Men)
- Luigi (3rd dub; The Adventures of Super Mario Bros. 3)
- Hak Foo (2nd voice; Jackie Chan Adventures)
- Walter Hardy / Cat Burglar (The Spectacular Spider-Man)
- Ursinho da Pesada (Ursinho da Pesada)
- Boomer (2nd dub; The Fox and the Hound)
- Narrator (Ratatoing)
!~

Katsuma Nonaka