Froggy is a frog, and the best friend and buddy of [Big the Cat](https://anilist.co/character/14760). He has been rescued by Big and friends when he has gone missing or undergone a strange transformation.

Back on Sonic's home planet, Eggman has collected all 7 of the Chaos Emeralds, and is about to have absolute power when Sonic interferes, causing an explosion that sends everyone from their world to Earth. Sonic and his friends team up with 12 year old Christopher Thorndyke to collect all the Chaos Emeralds and defeat the evil Dr. Eggman. 
(Source: Anime News Network)

[Profile (Aoni)](https://www.aoni.co.jp/search/aso-tomohisa.html)

Short comics released on the official Japanese Sonic the Hedgehog website, Sonic Channel, as part of the franchise's 25th anniversary celebrations. Each comic focuses on individual Sonic characters featured in the Character Profiles on Sonic Channel often featuring slice-of-life moments or references to their backstory in past games. (Source: Sonic Wikia, edited)

Kaeru-kun