1. 

Name: BioMerge  

Gender: male

Race: R.O.B. Smasher

Affiliation: Ze-Pyromancers

Appearance: 

Element: Plasma 

Love interest: Felicity

Biography: He's a surviving Smasher from the World of Trophies who eventually fled to Critopolis and joined Ze Pyromancers, ready to help his new friends take down the evil forces of his nemesis Omniscient.

2. 

Name: Felicity 

Gender: female 

Race: Iron Valiant robot Smasher

Affiliation: Ze-Pyromancers

Appearance: 

Element: Crystal

Biography: She was once a deactived robot, abandoned and disused, before BioMerge found her and repaired her. Now she's an ally in his fight against evil and eventually even develops romantic feelings for him! Aww, adorable robot romance is tight!

3. 

Name: Omniscient 

Gender: male

Race: R.O.B. Smasher (formerly) EMMI (currently) 

Affiliation: The Order of Steel

Appearance: 

Element: Tech

Biography: Like BioMerge he used to be a ROB Smasher from the World of Trophies, but he thought his old body was far too limiting for his evil ambitions, so he used his Smash Coin to reincarnate into a proper killing machine, an EMMI. Now he seeks revenge on BioMerge and seeks nothing less but the extermination of all his enemies...

And here are the different types of robots in The Order of Steel:

Because if you're an evil mastermind with grand ambitions, you need foot soldiers to help carry out said ambitions.

On a personal note: I gotta say, as someone who actually played Sonic 2006 back in the day (to COMPLETION, I might add; young me was oddly patient and VERY foolish), it's interesting seeing some of the more realistic designs Eggman's robots had. They'd honestly fit in more with the movie series' design aesthetic for his robots, but that's just me speaking here. Anyways, enjoy!