Alexander is a stuck-up prince that reeks of entitlement. He's always overly confident in his abilities, even when he shouldn't be. He always acts like he has something to prove and holds an air of superiority over "ruffians" and the like. 

I don't want stereotypical posh for Alexander's voice, though I do want someone who knows how to carry themself. He's rather arrogant, which means he typically ends up in comedic situations, so he should have a wide range of emotions despite sounding smooth. Think along the lines of Nezha (dub) from Monkie Kid.