I'm Bored, so Let's play a Game.

The first one to answer this question completely will get a free request drawing. Now the question is extremely anime-related, but I hope you people will figure it out.
The Question is....

What does Zapp Renfro, a character from the anime series Blood Blockade Battlefront (Kekkai Sensen), have in common with each of the following anime characters specifically? (Note: Each character I'm about to list off has a SINGLE prominent similarity with Zapp.) (P.S. The first one should be easy.)
1. Chain Sumeragi from Blood Blockade Battlefront (Kekkai Sensen)
2. Vash the Stampede from Trigun
3. Roronoa Zoro from One Piece
4. Worick Arcangelo from Gangsta
5. Nathaniel Hawthorne from Bungou Stray Dogs

GOOD LUCK!