Originally Posted by
Axethor
Rumble, Katarina, and Diana are all good right now for melee AP characters. However, unless your laning as Diana, they all use pages which differ slightly from the standard AP page. Rumble and Kat do not use mana, so you will need new seals. For Rumble I use Armor and Kat I use AP/lvl. Since Rumble is more of a tanky mage, I run MR/lvl glyphs on him. Diana can use a standard AP page, but that's only in lane. In the jungle I use AS reds and Armor seals.
Galio can be played as full AP and still do well, though he is more of a niche pick that builds MR to counter AP heavy teams.
Evelynn can be built full AP, but she is still weak right now.
Kassadin is melee AP, but he is always banned in Draft and ranked.
Gragas is a strong Melee AP whole is becoming more popular with his use in recent tournaments.
AP Yi if you feel like playing a useless gimick.
AP Warwick is pretty good as well, though he is built more bruiser than full AP.
Fizz, crazy AP assassin.