Hybrid Champs and Items

Lets have a talk about Hybrids. I am including champs as well as items here. This is mostly a thread for discussing ways that they could be healthy for the game, as in the past many people as well as reds have said that hybrid is too difficult to deal with, but I think there is a way it can be healthy. All ideas are welcome but can we please have an actual discussion on it.

For starters I think that building items that provide 1 benefit to an ad champ and 1 benefit to an ap champ are good for hybrid champs/builds, but how can it be done to be healthy and not unbalance the champions that already have a role.

My main thought for hybrid is Kayle, I love to build her hybrid, and most people don't expect it, and while the damage output is slightly lowered it is a tradeoff I make for being able to do multiple types of damage which is harder to build against. Guinsoo's and the current gunblade work well for this, and obviously Nashors helps too but realistically that is the limit. I would like to see more items that can be chosen from and I would like to see it as a viable option that actually can compete with other builds without unbalancing the non-hybrid champions.