I've wondered about how much agency the aeons have, too. The fayth themselves seem unable to manifest very far from their statues (with the exception of Bahamut) so the only way for them to exercise their power is with the help of a summoner. And we never hear of aeons going rogue or turning against their summoner so it seems like they have to obey the commands given to them.
Also, aeons are formed from the merging of the fayth and the summoner, so they can't exist independently of their summoner. And they grow stronger through the bond with their summoner, so an aeon that didn't like its summoner would be weak.
Seymour's mother is an interesting case because she expresses regret for how he turned out as a result of his troubled childhood, and his obsession with power after receiving her aeon, but since she can't stop him by herself, she gives Anima to Yuna and asks her to destroy Sin to end his obsession. She doesn't ask her to fight Seymour directly . . . but you are free to summon her when you do.
I think the fayth probably have the power to reject a summoner by simply not answering their prayers to grant them an aeon, but that's all. And it's possible that a summoner might die trying to take in a fayth that was just too powerful.
I've wondered if that was what happened to Lady Ginnem, but Lulu makes it sound like it was the fiends in the cave that did her in. (Only in a brief mention, though. The pieces of her backstory are vague and hard to put together.) How she obtained Yojimbo and became an unsent and how Lulu got out of there are mysteries as well. I had to come up with a viable answer for my comic, but there really isn't one given in the game.
Father Zuke is actually now a monk at the temple in Bevelle, as revealed by some conversation options when you meet him. But I think there must be some kind of punishment or required penance if a summoner quits their pilgrimage, and it is likely that he'd be shunned by some people.
In the end Bahamut asks Yuna to free the aeons because they're tired and want to be able to rest in the Farplane, but it's possible that they also just want to be free. An interesting note: several of the aeons (Valefor, Shiva, and Anima that I've noticed, there could be more but I'd have to get a closer look) have chains of some sort incorporated into their design, indicating bonds of servitude.
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Also, aeons are formed from the merging of the fayth and the summoner, so they can't exist independently of their summoner. And they grow stronger through the bond with their summoner, so an aeon that didn't like its summoner would be weak.
Seymour's mother is an interesting case because she expresses regret for how he turned out as a result of his troubled childhood, and his obsession with power after receiving her aeon, but since she can't stop him by herself, she gives Anima to Yuna and asks her to destroy Sin to end his obsession. She doesn't ask her to fight Seymour directly . . . but you are free to summon her when you do.
I think the fayth probably have the power to reject a summoner by simply not answering their prayers to grant them an aeon, but that's all. And it's possible that a summoner might die trying to take in a fayth that was just too powerful.
I've wondered if that was what happened to Lady Ginnem, but Lulu makes it sound like it was the fiends in the cave that did her in. (Only in a brief mention, though. The pieces of her backstory are vague and hard to put together.) How she obtained Yojimbo and became an unsent and how Lulu got out of there are mysteries as well. I had to come up with a viable answer for my comic, but there really isn't one given in the game.
Father Zuke is actually now a monk at the temple in Bevelle, as revealed by some conversation options when you meet him. But I think there must be some kind of punishment or required penance if a summoner quits their pilgrimage, and it is likely that he'd be shunned by some people.
In the end Bahamut asks Yuna to free the aeons because they're tired and want to be able to rest in the Farplane, but it's possible that they also just want to be free. An interesting note: several of the aeons (Valefor, Shiva, and Anima that I've noticed, there could be more but I'd have to get a closer look) have chains of some sort incorporated into their design, indicating bonds of servitude.