Kog is a void creature who's constantly hungry, but nothing in his kit shows him eating anything. Instead, he's constantly vomiting projectiles, emptying his stomach.
I've wanted something added to him that plays on his lore as a gluttonous creature from another realm.
Something like this
Voidigestion: Kog'maw's body produces a highly volatile and corrosive acid meant for pre-digesting his prey before consumption. Additionally, units that die that were recently damaged by Kog'Maw leave behind dissolved flesh (represented by small bubbling pools). He may activate dissolved flesh within 150 units to consume them instantly (does not apply to wards or structures). His damaging abilities and basic attacks reduce a target's armor by 1 +0.5% plus an additional +0.1 +0.05% per dissolved flesh consumed, stacking up to 5 times against a target. Upon death, Kog'maw loses all his acquired stacks of dissolved flesh.