I'm going to be perfectly honest with you. You will hate me, but...
- Regular Assasians/fighter items often used on ADC thoughout the years/just now.
- New ADC item that is used by a few fighters.
http://na.leagueoflegends.com/na/site/2016-season-update/preseason.html it did come with ADC itemzations believe it or not..
- Melee only items
-Ranged only item
Only person who could use Runnans+Hydra is
but heck that combo hasn't been viable on him since...Yea..
#Unless riot slaps a big (Melee/ranged only) Sticker on the item. I don't think they really care who uses the items unless they become too strong with it.
Because using the wrong items often leads you to lose power, not gain it.
this is the meta, although riot works the balancing with the ever changing meta that we create by trying out bullshit builds on EVERYONE. Even now somewhere out there-there is a Summoner finding something OP on X champion(s). Someone had to have tried things first before they became known. (Those Koreans... Well most people do refer to it as "Korean build ADC name here")
These items may not have been used on many ADCs before, but the fact of the matter is they're being used now. No amount of "But they're supposed to be assassin items!" Is going to change that until riot tinkers with the numbers/code.
It sucks, but it's the truth.
#This is why no one can have nice things... Especially supports. (BECAUSE MAGES!!! Sorry supports but it's true, as a fellow support secondary.)