A corrupted ancient spirit that was once good but has been twisted by dark forces. This spirit might envy Sonic and Amy's relationship and decides to turn their world into a nightmare. It could be using its control over the elements in this dark story to cause chaos and harm to Sonic and Amy.
It could be an evil wizard who wants to use Sonic's speed and Amy's strong will for his own dark purposes.
Maybe a powerful demon that feeds on love. Since Sonic and Amy have a special bond, it sees them as a great source of energy and tries to break them apart. The demon could be creating illusions and obstacles to make them doubt each other.
Perhaps a new character, a dark sorcerer. This sorcerer might be jealous of Sonic's popularity and power. So, he casts a spell on Sonic that makes him act out of character. In this 'dark sonamy story', Amy has to face this sorcerer who is much more powerful than she is, but she's determined to save Sonic no matter what.
It could be about Sonic and Amy getting into a really tough situation in a spooky, shadowy world. Maybe they face a powerful and evil force that tries to break their bond.
Well, a 'dark sonamy story' might involve Sonic being corrupted in some way and Amy having to struggle to save him. Maybe Sonic gets possessed by an evil force and starts to turn against his friends, and Amy, with her unwavering love for Sonic, refuses to give up on him and embarks on a dangerous journey to find a cure or a way to break the curse.
The plot could be that Sonic gets cursed and starts to have a split personality. One side is his normal self and the other is a dark and violent version. Amy is in love with Sonic's normal side but is scared of the dark side. She tries to find a way to break the curse while still loving Sonic through all the changes and the danger that the dark side poses to her.
Cinderella herself could be the villain. In a dark take, she might be using her charm and the situation to her advantage in a malicious way. For instance, she could be faking her kindness to the prince just to get into the palace and then cause chaos.
It could be the Jabberwocky. In a darker take, the Jabberwocky could be a more prominent and terrifying presence. It could lurk in the shadows of Wonderland, preying on the innocent inhabitants and even targeting Alice. Its very existence could be the source of the darkness that has fallen over Wonderland.
One possible dark Sonamy love story could be that Sonic, usually the hero full of light, gets corrupted by an evil force. Amy, still in love with him, tries to bring him back. But Sonic, in his corrupted state, keeps pushing her away, yet Amy refuses to give up, and her love becomes a glimmer of hope in the dark situation.
The dark Sonamy comic usually has a moody and intense style, with complex plots and emotional depth.
The main villain could be a powerful and wealthy business - animal who is involved in illegal activities on the side. They use their legitimate business as a front to cover up their crimes, such as smuggling rare and endangered species for profit. They have a network of hench - animals who do their bidding and are very difficult to catch because of their influence in Zootopia's high society.
Perhaps the main villain is an old enemy of Jaden and Zane who has found a way to gain more power in the Dark World. He has set traps for them in this new and dangerous realm. He could be using the Dark World's unique properties to his advantage, like creating illusions that make Jaden and Zane doubt themselves and their friendship. The villain's goal could be to not only defeat them but also to use their defeat to gain even more power and spread his evil influence across both the Dark World and their home world.