Quit playing before Elesis' ST, huh? There were so many updates to the game since then.
Checking the list of patch notes might help a bit.
Well, a character with a high comboing ability would be Dio, the first of the AP characters. He was built for making combos. The right side of his skill tree is more combo-centric than the left side, so I say you should go for it whenever you get him.