@Riot. Any chance you guys might come out with a mage who can fill the ADC role?

You mean Corki?

reason why mages arent a good chocie for the duo lane is, because theyre level and item dependent. sharing xp with a support puts them behind in comparison to the enemy adc and support, as idc are only item dependent and a lot less ability/level dependent.

so theyd need to do an xp sharing mechanic for mages. imo they should do something similar with relic shield (have the item share gold and xp), so melees are able to duo lane aswell.

Consistent damage at safe distance with good kiting potential, in terms of team fight.

However, adc isn't required for skirmishes or team fights. Main role of adc is to take down towers at safe distance, so in that sense fits the role better.

think ziggs can do it too

Depends on what you want.

Sustained magic damage?

Strong objective control?

Duo lane synergy?

More item-dependent than level-dependent?

I can come up with a few ideas, but that's all. If you want, go ahead and experiment with

Corki is already the hybrid damage carry, so I didn't bother with him or Koggy, and the last three are played as support but could potentially duo lane as the carry? For the first three, I recommend building rageblade and nashor's tooth if you plan on taking towers fast and want to keep up with aa harass.

I'd actually like to see Vlad turned into the first AP botlane carry. I don't know how they'd do it but it would provide a good solution to his problematic 1v1 gameplay.

Azir, Cassiopia, and Ziggs could be pretty decent at providing constant DPS.