Another possible antagonist could be a relative, say her sister - in - law. The sister - in - law might be resentful of the attention the wife gets in the family. So, she might try to undermine the wife at every opportunity. She could start family disputes and make the wife look bad in front of other family members. Over time, this constant undermining can 'ruin' the wife's relationship with her family and her peace of mind.
Perhaps in a 'wife gets ruined story', she is the victim of a false rumor. In a small town, someone spreads a malicious lie about her having an affair. This rumor spreads like wildfire, and she loses her reputation. Her friends start to avoid her, and she even faces discrimination in her community. As a result, her social life and mental well - being are 'ruined'.
It could be another person who also has some sort of mind - controlling abilities and wants to use the boy's powers for their own evil plans. This antagonist might try to trick the boy into using his powers in the wrong way.
There could be an ancient evil spirit that has a vendetta against griffins. When it senses that Cousland has befriended a griffin, it targets them both, trying to destroy their new - found bond and cause chaos in the world they inhabit.
It could be a new character, like a powerful wizard who has a grudge against Percy for some reason. Maybe Percy accidentally disrupted one of his spells, and the wizard is out to get him, which makes Percy mad.
It could be a lone wolf type of character. This person is a survivor in the same world as Clementine but has gone a bit crazy from all the hardships. They see Clementine as a competitor for resources and decides to shoot her to get rid of the competition.
It might be an accident - causing character. This could be someone who is clumsy or irresponsible. Their actions, even if not intentional, end up causing harm to Judy. For example, they might accidentally start a fire in a place where Judy is, and she gets burned in the process.
It could be Draco Malfoy. In some fanfictions, Draco might be pushed to such an extreme by his family's beliefs that he resorts to physical violence against Hermione. He might punch her out of jealousy or to assert his so - called superiority.
Team Rocket is an obvious choice. They could use some new, devious hypnosis device to control Ash for their own gain, like trying to steal all his Pokémon.
Dr. Eggman could be the antagonist. He's always trying to defeat Sonic, and shooting him could be part of one of his evil plans. Maybe he developed a new weapon specifically designed to take Sonic down.
Another option is a group of anti - magic fanatics. They view Percy's wings as an abomination because they are a result of magic. They hunt Percy down, believing that by getting rid of him and his wings, they are protecting the world from the 'evils' of magic.