Site with a lot of Undertale au characters or how to make my own?

[Shyde]

So I'm new here but have been playing Mugen since 2011. I'm a massive undertale fan and noticed that characters when it comes to Undertale AUs are pretty bare bones, either being cancelled or abandoned. I would like to know if there is a site with a lot of them that are not unfinished or maybe an easy tutorial on how to make my own? Or to finish them?