Nightmare's Human

Nightmare has been helping Error with preventing the balance from tipping any further into Ink's favor. To repay Nightmare and help ease his worries, Error introduces Nightmare to Lucario, his daughter. Nightmare could gain more power to keep the balance between his brother stable, while Error could ensure his daughter could be safe when she sleeps.

Everything starts to change with Lucario being around. She could be the key to help Error from his forced job. Lucario could be the key to understanding throughout the multiverse or complete multiverse domination under Nightmare. Only time can tell what will happen with Lucario there to turn tables and make friendships.

A/N: Inspired by @harrish6 and their works on Error. I also don't own anything like Undertale, the other AUs mentioned or the characters except Lucario. This was a request done for a good @NiceBreeze201.