This challenge is going to be a descendants challenge characters from Person 4 Golden series are descendants of the characters from the D Gray Man series you can mostly choose who is the descendant of whom, and who they married i up to you, but there are some requirements

Requirements:

Yu Narukami is the descendant of Allen Walker

The time line can start a bit before he move, when he is in Inaba, or after the true ending of the story.

Igor and the Millennium Earl are natural enemies

Optional:

Yosuke is the descendant of Levi Bookman

Chie is the descendant of Lenalee Lee or her brother Komoi Lee

Kanji is the descendant of Krory.