Sero is Parsley Kales' boyfriend and father of Basil. He is a expert martial artist and stronger than the average human. He and Parsley met when she found him injured after a battle with the androids and nursed him back to health.
He loves his daughter and girlfriend more than anything in the world, and will do anything to protect them.
Sero is soft spoken, but he's no pushover. Although he has a mild demenor, he can get aggresive and downright scary when agrivated.