I think it would be kinda cool if they did it like FF8 (words that shall never again be spoken) and you could improve your affinity with each summon; maybe having a team element to it where higher levels of team summoning create more devastating moves. At least, that's what I hoped for when I thought summoning might be a thing that all players had as a limit type move. Guess it could work kinda the same for a Summoner class.
Ok, now we're going to get slash fiction of Wint x Kachi somehere... rule 34 and all...
Never confuse your inference as the listener for an implication of the speaker.
Good games are subjective like good food is subjective. You're not going to seriously tell me that there's not a psychological basis for why pizza is great and lutefisk is revolting. The thing about subjectivity is that, as subjects go, humans actually have a great deal in common.