Moss

Moss (モス) is an archduke in the Underworld and one of Testarossa's subordinates. He has stood undefeated for tens of thousand of years, with his strength second only to the Primordials. Along with Cien, he serves as Testarossa's lieutenant.

Appearance
He assumes the appearance of an adorable young boy who, according to Rimuru, looks like an elementary school student in 5th or 6th grade. His hair is grayish-white, a slight deviation from Testarossa's signature silver white, proof of his lineage. From appearances alone he doesn't come off as formidable at all, even though he's a super old demon whose lived several millennia.

Background
He is a demon of the pre-historic species and a high ranking individual of the ruling class in the demon world; a subordinate to Testarossa. He dueled Veyron several times while in the Underworld and always came out the victor, resulting in Veyron's many reincarnations. One day he got recruited by Diablo along with his master to serve Rimuru. Initially he was opposed to Diablo's demands (as with several others), but after taking a beating from him he reluctantly bended to his coercion in the end. Upon meeting Rimuru and acquiring a body, he received the name "Moss" from him and evolved to a Demon Peer. From then onwards he genuinely pledges his loyalty to Rimuru, and now operates in Tempest. He specializes in reconnaissance and espionage, similar to Souei. He's also an officer in the Black Numbers reporting directly to Diablo, with Testarossa holding a superior position as a co-leader.

Relationships
Testarossa: He's highly devoted to her. In fact, it's an accomplishment that he even stood by her side for as long as he has in spite of her egocentric personality, a testament to his loyalty. Moss does not tolerate any insult towards her. He's very quick to amend his conduct when he pisses her off.

Rimuru: He gave him both a name and body. Moss admires his wisdom and foresight and like all of Rimuru's subordinates, does not tolerate disrespect towards him.

Diablo: His boss and superior. Moss was initially opposed to Diablo's demand to serve Rimuru but after he took a beating, he folded to his coercion and now works for the Black Numbers under Diablo.

Souei: They work together under Rimuru's recommendation, their similar talents and capabilities complement each other so they cooperate from time to time.

Veyron: They've dueled several times in the past and now operate in Tempest together.

Cien: A fellow lieutenant of Testarossa. They both work in Tempest currently.

Trivia

 * Named after the, a limited edition of the Mercedes-Benz SLR McLaren, which is in turn refurbishing of the 50s' Mercedes-Benz 300 SLR.

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