The Demon Prince in reality a puppet to Melascula he is Leader of 7 deadly sins representing the sin of Wrath despite this Zeldris only lashes out when he fails to do something like failing to impress his girlfriend Gelda a Vampiress Maid of his and often goes on destructive rampages Zeldris has serious anger issues and can be ticked off by any minor thing he sees as important for example when you say a lie to him he will smash you to smitherens Zeldris is painfully honest and despises lying. 