Netsuki appears as a young man with short red hair and short horns on his head.
Netsuki was initially very prideful and arrogant, especially about his abilities. He grew more humble after seeing the great difference in strength between himself and Rou.
He never forgets a grudge, and will hold on to it until he's satisfied.
During a friendly competition with adventurers (with Rou charging admission fees), 1,000 gold coins were offered as reward to anyone that could defeat him.
It is later known that the Wolf Hero was the one who turned him into a slave.
He takes his revenge during the Holy War by killing him but refused his sacred treasure.
Netsuki is skilled in the use of a sword and can emit flames under his control.
He received a new ability ever since Ranking Up, called 【Purgatory Demon Sword】. His Demon Jewel (Ogre Orb), that becomes a flamberge gushing flames when released, now becomes gigantic when 【Purgatory Demon Sword】 is used, and he enters a state where the flames he is clad in are strengthened. Because he becomes just like a miniature sun in such a condition, if one doesn't have 【Tolerance】 or 【Complete Tolerance】, it seems like it would be difficult to approach first.