Nicknames
SO as noted in my app and familiar to people who played Okami, since Chibi can't talk, people make up nicknames for him! (In point of fact, "Chibiterasu" is actually just a name Issun made up and then shortened to "Chibi"). Chibi is a little less laid-back about this than Ammy in that he makes sadfaces when people give him undignified nicknames, but he answers to them anyway. Everyone is free to make up their own nicknames for him if they want \o/ The following list is more for my own reference.
Canon
Issun: Chibi
Kuni: Mutt
Nanami: Squiddy
Kagu: Pooch
Kurow: dude, boy
Manpuku: Pork Chop
Camp
Ronan: Snowflake
Beatrice: Inutarou
Cindy, Yuki: Sunny
Mayuko: Koyuki
Takeru, Genta: Chibi
Accelerator: Fuzzy
Superboy: Pup
Toboe: Sunrise
Niche: (dumb) puppy
Yotsuba: Paint
Dio: Gelido
Ben: Albedo
Canon
Issun: Chibi
Kuni: Mutt
Nanami: Squiddy
Kagu: Pooch
Kurow: dude, boy
Manpuku: Pork Chop
Camp
Ronan: Snowflake
Beatrice: Inutarou
Cindy, Yuki: Sunny
Mayuko: Koyuki
Takeru, Genta: Chibi
Accelerator: Fuzzy
Superboy: Pup
Toboe: Sunrise
Niche: (dumb) puppy
Yotsuba: Paint
Dio: Gelido
Ben: Albedo