He is a Blackghost Knight, bound to earth by the pain and anger of losing his wife and kids. He is Kelvin's second contracted monster. As of episode 5, he has evolved into an Abyssal Knight Commander.

Waking up in a strange new place with no memory of his past life, Kelvin learns that he’s bartered away those very memories in exchange for powerful new abilities during his recent transmigration. Heading out into a whole new world as a Summoner — with his first Follower being the very goddess who brought him over! — Kelvin begins his new life as an adventurer, and it isn’t long before he discovers his hidden disposition as a battle junkie. From the Black Knight of the Ancient Castle of Evil Spirits to the demon within the Hidden Cave of the Sage, he revels in the fight against one formidable foe after another. Join this OP adventurer in an exhilarating and epic saga as he and his allies carve their way into the annals of history! 
 
(Source: J-Novel Club)

__Non-anime roles:__  
* Alfred in "Princess Lover!" (Visual Novel)  
* Busho/Generals & Advisor Vocals in "Sangokushi Taisen 3" (Arcade)  
* Ogam in "Tears to Tiarra" (Visual Novel)

Waking up in a strange new place with no memory of his past life, Kelvin learns that he's bartered away those very memories in exchange for powerful new abilities during his recent transmigration. Heading out into a whole new world as a Summoner — with his first Follower being the very goddess who brought him over! — Kelvin begins his new life as an adventurer, and it isn't long before he discovers his hidden disposition as a battle junkie.
 
From the Black Knight of the Ancient Castle of Evil Spirits to the demon within the Hidden Cave of the Sage, he revels in the fight against one formidable foe after another. Join this OP adventurer in an exhilarating and epic saga as he and his allies carve their way into the annals of history!
 
(Source: J-Novels)

Gerard