if some characters play together that have intwined lore then their team receives a bonus could help to balance out for feeding

Uhm.

yi and wukong get atk speed and movement. garen and lux armor armor and magic pen. may help with people to work together with a team comp.

It's an interesting concept, but it would be pretty unbalancing as well. People would probably rage that nobody wants to pick a character that is complimentary to theirs. Plus it would give a big advantage to organized teams.