Hextech Sabatuer
ok so hextech sabatuer...one thought for him is that all his item slots are filled and his abilities upgrade the items when you level them. items would be something like shrink ray, to either like shrink an item the person is carrying and have abilities on the item backfire on the user for the duration, or the item reduces armor and if the target has over x armor it does a ton of damage to them instead. a construct dissasembly device that kills minions and monsters and towers really well, possibly similar to how ivern jungles, just with more explosions, like takes a bunch of time to setup this device at a jungle camp, that then makes a huge explosion clearing the camp and doing some damage to this champion, but if it is used on dragon or baron it gives them a huge buff instead for some sort of duration. forgot what the third item was...fourth item is a teleport back to base, so you target enemy champ, run up to them and you both teleport back to your respective bases. then a really good healing item and a really good vision item. perhaps that third item was like the first but for magic resist instead...or it was some sort of mobility item. or an item that makes shooting skill shots at this person a risky option, like a spell reflect or a shield that charges and does something crazy when fully charged or idk something. but the basic idea is to mess with the basics of the game in fun and interesting ways, likely be a great split pusher and disrupter... Have dialogue that makes quips at items not being so useful when he shrinks them, or how when he uses an ability comment about how it isn't working as intended. probably not a yordle, but a personality somewhere between ziggs and heimerdinger... and yes the idea is for this champion to not build normal items, also not have scaling on abilities, just the base values.
The two big ideas behind this champion is one, messing up tanks really well, but being pretty useless against any damage threat. Also unabashedly wrecking PVE. So sits in an empty lane, shoves it in like crazy and wrecks the towers. If the usual response of split pushing of the tank shows up, this champion makes them cry, or at worst some one else shows up teleports both of them back to base before they are able to make this champ go squish.