Okay, let's see... Helmeppo's mom is a bearable person, and since Morgan became downright unbearable after the Kuro business, she up and left. I'm certain she would have taken her son with her if he wasn't enjoying being a prick so much. She'll meet Meppo someday and it will be glorious.

Helmeppo will also surpass Morgan. Like, way surpass. Some day they'll find him and Morgan will be all "y halo thar, worthless son" and Helmeppo will wipe the floor with his sorry ass. Yeah.