The Dragonoids are a species of beings that make up the main antagonists of Tai-Chi Chasers, who seek the powers of the Tai-Chi symbols. They currently are at war with the Tigeroid race to get them.
Later as the main Dragonoid team started to shrink, the emperor sent new warriors known as the Dragon Assault Squad.
All Dragonoids can seem to grow dragon like scales on their bodies (which aren't as easy to spot as a Tigeroid's stripes). This also seems to make them more resistent to attacks. As mentioned by Garnia when he attacked Sena and Finn in the series premiere, the Dragonoid race seem to be cold blooded.
The Dragonoids also have robotic guards that follow their orders and commands.