In Mega Man Star Force, who is the 11-year-old protagonist?

The 11-year-old protagonist of Mega Man Star Force is Geo Stelar.

Geo is an 11-year-old fifth-grader living in Echo Ridge. At the beginning of the story, he has withdrawn from school and other people while grieving the presumed death of his father, Kelvin Stelar, who disappeared after the Peace space-station disaster.

His life changes when he encounters Omega-Xis, a rogue FM-ian alien. The two perform an EM Wave Change, allowing Geo to become Mega Man and operate in the electromagnetic-wave world. Geo’s personal recovery and his growing relationships are major parts of the game’s story.

The other options belong to different parts of the broader franchise. Lan Hikari is the central human character of Mega Man Battle Network, while Grey is associated with Mega Man ZX Advent and Vent is a protagonist of Mega Man ZX. They are not the 11-year-old lead of Star Force.