Zeldris is very calm and collected, seemingly not easy to anger. Like his brother, Meliodas, Zeldris appears to have a good commanding and leadership skills. Zeldris is highly confident in his abilities. Clashing with his own brother Meliodas in the past, a very powerful opponent and remains unfazed at the prospect of doing so again and even initiating an attack against him. He has a medium-low pitched voice (also just a deeper and more serious version of Meliodas).