Are some unusual honorifics used in Shougeki no Soma actually used in regional dialects?

Question

I noticed some unusual honorifics used in the Shokugeki no Soma anime series:

• Yuki Yoshino tends to use "-cchi", as in "Erinacchi" or "Takumicchi"
• Terunori Kuga tends to use "-chin", as in "Yukihira-chin"
• Momo Akanegakubo tends to use "-nyan" or "-myan"

Akanegakubo's usage was described as a personal affectation to describe people that were cute (and also to look down on them a bit), but are the first two actual regional usages or due to a personal style/usage of the speaker?

Answer 1

Those are not honorifics per say, they are suffix you can add to make nicknames, same as -chan. And they are certainly not limited to a prefecture, aka, they’re not from a dialect.