Sonic News Network

Know something we don't about Sonic? Don't hesitate in signing up today! It's fast, free, and easy, and you will get a wealth of new abilities, and it also hides your IP address from public view. We are in need of content, and everyone has something to contribute!

If you have an account, please log in.


Sonic News Network
Sonic News Network

A small frog bot that hops a bit when not standing in place.

— Description, Sonic the Hedgehog Encyclo-speed-ia

The KeroKero[1] (ケロケロ[2] Kerokero?) is an enemy that appears in the Sonic the Hedgehog series. It is a mass-produced, frog-based Badnik model created by Dr. Eggman.



KeroKeros are based on frogs. They possess a violet color scheme with yellow stries on their bodies, gray underbellies, toes and joints, and cartoonish black eyes.

Game appearances

Sonic Advance

Tails standing next to a KeroKero, from Sonic Advance.

In Sonic Advance, the KeroKeros appear as enemies. They are encountered exclusively in Neo Green Hill Zone.

In gameplay, KeroKeros make small jumps toward the playable character and will be croaking occasionally. This Badnik is relatively harmless and the only real damage they can inflict is if the playable character runs into them. To defeat a KeroKero, the player can use any attack, although the Spin Attack and Spin Dash are particuarly useful against this enemy. Also, upon their destruction, they will release an Animal.

Sonic Pinball Party

In Sonic Pinball Party, the KeroKeros make an appearance as obstacles. They can be found on pinball tables.

Powers and abilities

As per their design, the KeroKeros are excellent jumpers.


  • Its name comes from "Kero", a Japanese onomatopoeia for the croaking of a frog.


  1. Flynn, Ian; Sega (8 December 2021). Sonic the Hedgehog Encyclo-speed-ia. Dark Horse Books. p. 122. ISBN 978-1506719276. "KeroKero -A small frog bot that hops a bit when not standing in place."
  2. (in Japanese) ソニックアドバンス必勝パーフェクトガイド Aspect. February 8 2002. p. 28. ISBN 978-4757209480.

Main article | Staff | Glitches | Beta elements | Gallery | Re-releases (SonicN, Android)