Gremlin

Not much is known about Gremlin yet, though it is clear that he is a member of Disaster, in which Kyoya Gaen is the leader.

Personality
He appears to be a silent and serious person who doesn't talk much, not even when addressed by Kyoya, who is his leader, and not reacting to receiving praise about the deck he built for Shido. He doesn't seem to think very highly of Davide Yamazaki as well, as seen when he implied that Davide was usually a dumb person, when Davide asked about the new deck Gremlin made for him.

Appearance
Gremlin has dark red hair that is mostly spiked upwards, with some pointing out both sides like bat wings, some bangs that reaches his eyes, and some hair framing his face. He has very light blue eyes, a trait he shares with his cousin Baku, and is always seen with a serious expression on his face. He is now seen wearing the standard Disaster team uniform.

In his younger years, as shown in Baku's flashback, the hair framing his face as well as the ones sticking out by the side was not seen, making his appearance very similar to that of Baku's

Biography
He first appeared near the end of episode 34, being the last member of Disaster to arrive at the meeting Kyoya held for the Disaster team. He is then seen solemnly listening to Kyoya's speech of the Disaster team being his "friends", and the remark to keep an eye on Kiri Hyoryu, Gao Mikado and Tasuku Ryuenji.

In Episode 40, it is revealed that he is Baku's cousin, who in the past taught Baku how to build his first deck, as well as revealed to him the existence of the Darkness Dragon World. It is also revealed that he is the deck builder of the Disaster team, as shown when he built Davide Yamazaki's new deck, as well as Shido's new deck that defeated Genma, as mentioned by Davide.

He is voiced by Kenjiro Tsuda (Japanese) and Joel Crichton (English).