Though I haven’t paid much attention to any other necromancers in other anime, I believe its Ain Ooal Gown (Momonga) from Overlord.
Chaos Necromancer (anime). Page issues. Main card page: “Chaos Necromancer”. Chaos Necromancer. Japanese: カオス・ネクロマンサー; Rōmaji: Kaosu Nekuromansā.
