Taii is a Mu human sized sentient robot that was salvaged and reprogrammed by the crew of the GlomarEmaan ship.
Despite his small size he is equipped with concealed missile pods in his chest, capable of destroying much bigger enemy mecha. Taii is also armed with a plasma cannon that he uses as cane.
He was apparently destroyed at the end of the original Orguss series, but is later revealed to have survived and self-repaired himself, ending in another dimension and taking part in the events of Orguss 02 (in modified form). Taii built the advanced Orguss 02 (mecha) from that series.