Oh right, Kurofune is Digi-tan's number one oshi. Though so far she is only referred to in game dialogue (with Digi cheering for her from the stands) and the game hides her name by referring to her as "Number 4-chan".
Ironic considering IRL Digi punted Kurofune from Tenno Sho thanks to how the "gaijin" slots work... Not that that didn't stop Kurofune from achieving his greatest victory, if not outright accelerate it.