So something I thought would be fun, was to come up with Nicknames for the Characters who don't have any.
Here are some guidelines to help come up with nicknames for the characters:
1. It must relate to the character's ability/playstyle
2.Keep it to the playstyle/ability no referencing the characters personality
And yes you can come up with new ones for characters who already have one if you want to
Here are some that I came up with:
Achiga's Speedster Atarashi Ako
Deep Lord of the Mountain Shizuno
Achiga's Bowler Arata