M4 SOPMOD II's trusted yellow-colored Dinergate with a megaphone attached, joining her during the events of Continuum Turbulence and being part of her Neural Upgraded look (to the point she can equip Banana as a SPEQ).
During the events of Continuum Turbulence, the Dinergate was used as the temporary shelter of RO635's neural module, using its battery to ensure it remained on, thus preventing a memory wipe. Following CT, with RO having gotten a replacement body, SOPMOD had grown fond of it and dubbed it Banana (with RO bemoaning the choice).
