Pantheon: Builds Tanky dps or AD carry, he's strongly at early game when he can take you 2/3 of you life down with one combo, but he falls off late game. The fact that he can teleport its good, even better when a lane is getting ganked.
Mordekaiser: Builds Tanky or AP carry, Strong at every phase if played correctly (Morde solo top can wreck everything at early game). The thing that you can turn a 5 vs 5 into a 6 vs 4 its just epic (You ult the ad carry of them, kill him and BOOM, AD CARRY PET)