Disclaimer - I don't own anything except for Cadmus. Cadmus Mikaelson is a scary person... actually he's done right terrifying when he wants to be even his name scares Vampires to beg for mercy he even had the whole of the covens or magical families in England terrified of his 'family' who could talk to snakes. Cadmus is Klaus' favourite sibling just because he cares and maybe he cares a little too much for those he lets in, all he wants is for his family to be alive doesn't matter how as long as their together even if they don't realise he's helping and they think he's hurting them. And when Klaus thinks he can only trust himself he always goes to that coffin that's even closer and safer than the rest of his family. And he tends to not play well with his food. And he cares too much for a doppelgänger.