Ken Matsumura manages The Gundam Base, a facility dedicated to Gunpla models, where he lectures on construction techniques and guides builders of all skill levels. His avatar in Gunpla Battle Nexus Online (GBN) deliberately mirrors Henken Bekkener from Mobile Suit Zeta Gundam, reflecting his strong fandom for the character. He shares a longstanding friendly connection with Hiroto Kuga, having known him since Hiroto's youth. When Hinata Mukai applies to work at The Gundam Base, Ken assists her in adapting to the job responsibilities and workplace environment.