What are your personal trends that you notice about which champions you own? For me, I seem to lean towards the melee (Quite a bit to list here) and support characters (Sona, Taric, Soraka, Janna, Alistar), and oddly enough, the Demacian ones. (Garen, Jarvan IV, Xin Zhao, Lux, Poppy, Sona[?]) And oddly enough I don't own any of the Noxus champions at the moment either. (I don't count Sivir because she's an ex-Noxian)
I also have a severe lack in mage, assassin, and jungling characters. (Karthus and Lux for Mage, Evelynn and Pantheon for Assassin, and only Jarvan IV for jungling)