Based on bees, Robot Bees appear to be upgraded Buzz Bomber models. They have yellow thoraxes with small transparent wings on their back, and black abdomens with a yellow stripe which have either rail cannons or chained maces attached where their stinger would be. They also have black eyes with green sclera, red antennas and yellow mandibles.
Sonic the Hedgehog CD
In Sonic the Hedgehog CD, Robot Bees come in two types, each with a different attack pattern. The first type is found at Wacky Workbench. Similar to the Buzz Bombers, they fly around and fire fireballs at the playable character from their stinger when the player gets close. After attacking, they just fly forward. In the Bad Future or sometimes in the present timeline of the Round, Robot Bees show signs of decay. They also fly slower and are unable to fire fireballs.
The second type of Robot Bees appear in Metallic Madness, which have two maces attached on their abdomens by chains. These Robot Bees come as well in different variants: some may only have one mace while others have two that hang from chains of different lengths. For attack patterns, they fly back and forth while swimming their maces in different directions. The player will take damage by touching the maces, but can pass through their chains without harm. In the Bad Future or sometimes in the present timeline of the Round, they show no sign of decay, but they fly slower and only have a single mace.
Only the Robot Bees with maces attached to their their abdomens appear in Sonic Mania. They are also usually found along the Zone's unique pathways in the background. In gameplay, they behave like in their debut game: they fly back and forth while swinging their maces around. Also, when destroying a Robot Bee, it will release an Animal.
Robot Bees and Tonbos loosely resemble each other design wise for having similar transparent wings, antennas and different colored eyes despite being based on different insects.