Based on frogs, the Ribots are small Badniks with green and silver armor. They have a small pair of eyes and footrests. Most noticeably, they carry round weights attached to their heads by chains. They either carry a single one on top of their heads or two on both sides of their heads.
Ribots are only encountered in Launch Base Zone. Here, they remain in stationary positions either on the ground or on red support structures where they repeat their attack patterns constantly.
The Ribots have can one of three attacks patterns which is determined by the number of weights they carry. When carrying two weights, the Ribots either pound the ground from above or sweep the ground with both weights. When carrying only one weight, the Ribbots swing their weight through the air in a circular arc. Touching the Ribots' weight anyhow will inflict damage, so look out for their attack patterns. The Ribots themselves can be defeated with a Spin Jump.
In other media
Sonic the Comic
In the Sonic the Comic series published by Fleetway Editions, the Ribot is a part of Dr. Ivo Robotnik's Badnik army and is among the third generation of Badniks the doctor produced. A Ribot was among several Badniks about to be melted down by Robotnik as punishment for failing him.
The Ribbots' Japanese name is based on the word "Kero-kero" which is an onomatopoeia for a ribbit.