Thread:KusaNin/@comment-37992227-20181231015731/@comment-25156300-20181231035114

What you found was on a fanon site (fanon is for OC stuff). Kekkei Maru is not a real thing. It is fan made. It sounds like they were trying to make a version of Kekkei Mōra.

When researching canon material. It is best to use Narutopedia.

And Uchiha may not be a requirement, but Mangekyō Sharingan is, which shouldn't be used for a non-Uchiha OC.