Jenny, localized from the Japanese name Lenny, is a 16-year-old member of a tight-knit trio with Joe and Mike, transitioning to 17 mid-series. Her pragmatic determination and protective loyalty drive her resistance against the authoritarian Martian regime oppressing her family. Piloting the fire-wielding ninja robot Phoenix Thunderhawk, she matches Joe’s bold combat tactics, often saving him in battle. A local admirer, Kenji, pines for her unrequitedly, sparking irritation when others jest about his crush. Her romantic focus fixates on Joe, their bond strained by jealousy over his connection with an alien princess—a rivalry that erupts into clashes before cooling into a truce as the princess concedes shared affection and suggests alliance.

By the English adaptation’s conclusion, Jenny and Joe progress from one-sided longing to mutual confession. She simultaneously mentors Mike in his own romantic pursuits, balancing sharp advice with unwavering support. Her defiance against Martian military tyranny fuels missions ranging from covert infiltrations to frontline battles, all to shield loved ones and destabilize oppression. This resolve coexists with moments of vulnerability, shaping a character who navigates clashing loyalties, heartache, and duty without yielding her fiery spirit.