User blog comment:Rollnstoned/Types of Supports/@comment-1330314-20130812143115

The Hard Assister/Sustainer/Preventioner support differentiation isn't quite there. is both a Hard Assister (due to her ult and Q) and a Preventioner (due to her ult, Q and E), is both a Sustainer and a Preventioner (due to her silence),  and  can both Hard Assist with their CC and damage (plus Janna's ult puts her as an occasional Sustainer), and, ,  and  fit the bill for all three (Alistar has CC, heals and knockback, Kayle has her armor/MR shred, shield and heal, Sona has a heal, multiple auras and a stun and Taric has the bonus armor, heal and CC).

Looking at the current denomination for supports, you probably need to include some sort of specific Tank category, as a lot of supports excel primarily due to their ability to soak up a lot of damage. A lot of supports, such as Lux, Morgana, and, are also good because can supply a lot of damage, which you touched upon with your AP support category. Others, like Soraka, Sona, and Janna, are mainly there to stick to the ADC and complement their kit with utility.