Are some unusual honorifics used in Shougeki no Soma actually used in regional dialects? I noticed some unusual honorifics used in the Shokugeki no Soma anime series:

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

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?
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.