@Shard, Couple of things pal. What levels of arcane energy does Leo wield, is he a gifted child prodigy with magic, or a simple layman? And what do you mean by physical manifestations? I'd also like to know more about the coven Leo came from, in particular how they can be considered corrupt, like what sort of things do they do that drove Leo away, and why do they still hunt him? Then why did Zatanna find him interesting, what sort of things did he do to merit her attention? 

The last bit is just a small thing, but we're not the Titans. We're simply called the team, like in the Young Justice cartoon.