Zeldris

Zeldris is an elite warrior of the Demon Clan, serving directly under the Demon King as the Piety of the Ten Commandments. He is also the Demon King's representative as well as his youngest son. Zeldris is a short yet muscular young man. He greatly resembles his brother Meliodas, though with a few slight differences. His hair is black and grows counterclockwise to Meliodas' and they both have the same demon mark, except his is over his left eye instead of his right similar to his other older brother, Estarossa. His attire is crimson in color and has an insignia (presumably representing the Demon Clan) on several places. He has silver gauntlets and carries his sword by a strap on his hip. eldris is very calm and collected, seemingly not easy to anger. Like his brother, Meliodas, Zeldris appears to have good commanding and leadership skills.

Despite being a demon and seemingly evil by nature, Zeldris does seem to have a somewhat caring side, 3,000 years ago when tasked with executing the vampire clan for their planned betrayal he instead chose to seal them instead of killing them all, for Gelda's sake, since he had a romantic relationship with her in the past, implying despite his evil nature, Zeldris is still capable of feeling genuine affection and love for others. While he holds tremendous anger for Meliodas's betrayal, he shows his belief that Meliodas is suffering due to having betrayed his clan after meeting Elizabeth, indicating Zeldris possess some doubts on their estranged relationship. He also showed care for his brother Estarossa, even saving him from an attack that could also kill him, and also showed great loyalty to his father, as evidenced by the fact that he, albeit begrudgingly, obeyed his father's order to crown Meliodas as the new Demon King. Zeldris is confident in his abilities. Clashing with his own brother Meliodas in the past, a very powerful opponent and remain unfazed about the prospect of doing so again and even initiating an attack against him. He also seems to be unwilling to negotiate with Meliodas despite being brothers and seems to hold a grudge against Meliodas, being labelled as a traitor among Zeldris and his fellow Ten Commandments. His confidence in his own abilities develops a certain degree of arrogance towards beings weaker than him. Likewise, he doubts Fraudrin's abilities because of him not being able to obliterate a country of humans. Zeldris is even confident that he alone is more than enough to deal with the Seven Deadly Sins,even smiling as he claims so and also believing that he is more powerful than Meliodas and therefore more worthy to be the new Demon King.

In his own words, the only things left for him are rage towards Meliodas and a desire for vengeance against the other four races. However, Zeldris has limits in his patience and, altough he rarely shows it, is not above mocking the ones he had an antagonistic relationship with, he clearly mocks Elizabeth in their short conversation and showing tremendous anger at her for being the reason of his brother's betrayal. He also gets angry after learning that Meliodas is set to be the new Demon King. Zeldris apparently has an unknown goal that he can only achieve by becoming the Demon King and thus would do anything to get the title. However, once Meliodas apparently offered to achieve this unknown desire, Zeldris reluctantly agreed to help Meliodas. As a member of the Ten Commandments and son of the Demon King himself, Zeldris is a extremely powerful demon. Like all members of the Demon Clan, he possesses the mysterious jet-black power of darkness which he can use for a variety of purposes, such as forming wings to fly. His aura, combined with the aura of the other Ten Commandments is so terrifying that it made the normally calm Hendrickson sweat in fear by their presence and unnerved Meliodas when he sensed it from several kilometers away. He has the ability to telepathically communicate with the other Commandments even throughout all of Britannia. Due to being the Demon King's representative, he is able to grant the Commandments to others and remove them from any member of the Ten Commandments if they allow it or if they are unable to fight back, shown when he was able to strip Drole and Gloxinia of their status as members of the Ten Commandments. He is also shown capable of supressing the powers of others, even ones as powerful as the Giant King Drole, due to being lent the magic power of the Demon King. He was also capable of inflicting Merlin, an individual with natural resistance to the effects of demonic magic. Zeldris has shown the ability to enlarge his demon mark similar to his older brother, Meliodas. According to Meliodas; due to having been lent the power of the Demon King, Zeldris's power can equal that of the Demon King and Supreme Deity, and that he has the power to remove the curse on him and Elizabeth. However, once Meliodas returned to become Demon King, he states that even with the power Zeldris borrowed from their father, it would not match the true power of the Demon King to which Zeldris agrees to.