Marcus Rivers (portrayed by child-actor Bobb'e J. Thompson) is a fictional 12 year-old character that was used by Sony Computer Entertainment America as part of their Step Your Game Up advertising campaign for the PlayStation Portable and PSPgo consoles in North America, much like the PlayStation 3's "It Only Does Everything" advertising campaign commercials with Kevin Butler.
In the PlayStation 3's community-based social gaming network, PlayStation Home, Irem has released a Game Space in the Japanese Home on December 3, 2009 to promote the release of R-Type Tactics II: Operation Bitter Chocolate on the PSP and PSPgo.