Marco is Polo's adopted sister. She is extremely shy, and only likes to talk to Polo. If anyone else is lucky, she might mumble a few words. Marco wandered away from her home when she was a baby and got lost far away. Her village's dictator mayor decided to war against a nearby village of mosaic chinchillas. When her and her dad were on a long walk together, her dad was attacked and killed. Marco had no clue what was going on and wandered off before anyone could find her. Luckily, Polo found her unharmed, but scared.
No one outside of the village really knows about the tangerine chinchillas, so Polo and tech were confused and had no clue where she came from. Tech eventually wandered close to the village, trying to find out where Marco came from. The village dictator didn't welcome outsiders, so Tech was violently chased away (and luckily, unharmed). They gave up and raised Marco on their own, since it wasn't worth losing their lives over.
Marco used to talk to Solo before the incident with Rhythm, who tried to kill her and her brother for talking to Solo. Marco wasn't hurt bad, but her "brother" was. Eventually, her and Rhythm become best friends. Rhythm eventually helps Marco overcome her shyness. She eventually is able to sneak into her home village with Rhythm and overthrow the terrible dictator. Marco then becomes the village leader and settles in with her mother.

Distinctive Feature(s): Marking on her chest is not symmetrical..

Fun Fact: Marco was originally a chinbot (robotic chinchilla)

http://www.solosterminal.pichusworld.net/marco.shtml