Fan Works / Not What I Signed On For

Cinders and Ashes: the Chronicles of Kamen Rider Dante has Syo and Charon leave Altair's team due to her partner, the Great Leader of Re:Shocker, turning people into Kaizo-Majin and having them cause havoc. Syo brings up how it's messed up that this is happening and Charon even says how he's here to save his world, not destroy another world.
Metal Gear: Green: Upon finding out his hero life involves scandals, paparazzi, signing autographs and basically doing nothing to actually help the people, Roland Gram abandons the hero life and joins the MSF, going under the codename Frigid Grizzly.
Roller Brawl: The Mega Cyborg: When an Emerald Spear overhears Lord Obsidian and Suna planning to blow up the ARTS convention, innocents be damned, he is shocked, citing this trope before attempting to warn the higher ups of the bombs before he gots shot by Lord Obsidian.

The Flash Sentry Chronicles: Lightning Blitz, after joining Flash and Iron as the newest defender of Ponyville, is a little frustrated when Flash has him doing tasks like babysitting the Cutie Mark Crusaders and helping with various odd jobs around town instead of helping defend the town from threats. Flash needs to explain to him that keeping the peace means more than just fighting bad guys.
In the Pony POV Series Wedding Arc two Changelings named Cricket and Monarch have a Heel Realization after coming to care about ponies and see them as fellow beings instead of cattle. They have this reaction when, by extension, that means their orders to kill Trixie amount to cold blooded murder, something they didn't sign on for. So they fake her death and aid civilians in making it to shelter in the coming conflict.

A Crown of Stars: Discussed. Daniel appeared in Shinji and Asuka's tent and offered helping them with their troubles if they went with him to his realm. They took up his offer, but upon arriving in Avalon, Asuka believes she is going to be forced to undergo therapy, and she remarks that is not why she agreed to come along. She is reassured that no one will force her to do anything.
In Neon Metathesis Evangelion, upon learning of the upcoming nude sync test all of the pilots refuse, stating that their job is to pilot the Evas and kill Angels, not prance around naked for all of command to see. While there's some initial fear of punishment, Kaworu points out they'll be fine so long as they present a united front; NERV can't afford for its pilots to quit.

Rosario Vampire: Brightest Darkness:
- Dark was once a member of Fairy Tale, but was Locked Out of the Loop about their Kill All Humans agenda. He discovered the truth when he learned that they planned to destroy Yokai Academy for teaching human/monster co-existence, and promptly defected.
- In Act III, Akua and Kahlua joined up with Fairy Tale and help Kiria in his plan with the intent to make Issa one of the top dark lords once humanity is subjugated. They are completely shocked when they find out that Kiria in fact planned to infect them with Blackheart and have them kill Issa so he would be the only ruler. They spend the entirety of Act IV trying to atone for their mistake.

The Legend of Spyro: A New Dawn: Drake was once a member of the Ape forces that raided the Dragon Temple on the day of Spyro's hatching. He only smashed one dragon egg that night... and immediately suffered a Heel Realization and fled Gaul's army. Even in the present time, he can't quite forgive himself.

New Tamaran: Upon learning his allies were helping Darkseid to invade Earth, Red X says it's not what he "signed up for".

Not What I Signed On For / Fan Works