How would you design Avatar's Favor?
Just for fun, I'm not really concerned with the mechanics and balance side.
"Avatar's Favor" was introduced partially as a mechanics response to the tendency of summoners to cycle avatars for their abilities rather than leave them out for longer stretches. However, it could also be said that Avatar's Favor is thought to have the 'story component' to show how the summoner had bonded with their avatar and that the avatar grew increasingly potent based on the duration (strength) of that bond. Previous FF games come to mind, with characters that had specific avatars they could summon, or something like FF8's system where each character had an affinity stat for each avatar depending on how much they had been called forth.
If it were you designing a system for FF11 that stressed the bond between Evoker and Evokee, or lent some advantage to leaving an avatar out for long periods of time, what would you do? Something like the buffs of Avatar's Favor, or an entirely different mechanic? I'd like to hear what creative things the summoners among us come up with!