Vlad also uses HP instead of mana, he's the only one left out of the list
He also happens to be very popular thanks to his passive, because some people find it awesome to stack AP to the 800s, thinking they can take lots of damage just by having HP xD
Speaking of which, I was playing Blitz yesterday in a co-op match, got him to 3.5k HP and 3.3k mana, 150/163 AR/MR and he died in
three seconds, death recap showing me 1.3k instead of the combined 5,150 HP damage that should have been dealt on me. How's that work? Note my bars were both full and my passive was ready.