Mael is one of the Four Archangels of the Goddess Clan. During the Holy War 3,000 years ago, Gowther and his "son" reforged Mael and everyone else's memories, giving the Archangel a new identity as a member of the Ten Commandments and the illegitimate son of the Demon King, under the name of Estarossa. While ruthless to demons, considering them as garbage and feeling no remorse for how many he killed, Mael seems to have been a good individual to those not associated with the Demon Clan, expressing deep remorse for killing so many innocents and his kin upon remembering what happened. He had enough willpower to turn himself from being a coward unable to harm an insect to the mightiest of the Four Archangels. He also was very proud of how highly Ludociel thought of him. He does not seem to be sadistic towards demons despite his hatred for them, as he prefers to use a technique that gives them painless death instead of beating them first. After regaining his memories, while under the influence of the Commandments, Mael became vengeful towards Gowther for what he did to him. He has became sadistic towards those who ally with Gowther, relishing in the pain Gowther felt when King was in severe pain from his attack. However, he seems to still consider his fellow Archangels as allies, greeting them cordially, clearly being surprised as of how they are against him, and while he fights them and King, he never strikes them with one of his attacks, only ever being shown to inflict grievous harm on King. This changes after he absorbs the Purity Commandment, where he has no qualms attacking anyone, even Elizabeth. After Gowther invaded Mael's mind and made him know the reasons behind why the Archangel was chosen by the demon Gowther to be turned into "Estarossa", Mael felt great remorse for his past indiscriminate killing of demons, allowing him to be able to expel the Commandments from within him. Free from the influence of the Commandments, Mael didn't hesitate in saving Gowther. Afterwards, Mael was unsure if he should continue to fight in the Holy War, asking if he should fight to defeat the Demon Clan as a member of the Goddess Clan. It was only after Elizabeth asked him to help end the Holy War instead that he joined the battle.