SCP-3161-1 was originally a knight named Sir Gregor Tudor who served the king of England presumably during the 15th century. After discovering an old tunnel system beneath the countryside of Shropshire, England which was constructed around 100 BC to 50 AD, they found some supernatural treasure that they summarized was a gift from God. The king used the treasure to give Gregor his immortality and appointed him to protect the structure from enemies until someone came to him and answer his riddle, 

"Hello!"

Powerful, nice hates Voldemort and the death eaters and protects harry potter

The Minstry which governs the magical world.

Yuji, Nanami, Geto and Gojo chilling in the park.

nice, trustful, and loving, impatient, curious

Beautiful, and Good