Tisse Garland is a petite assassin who joined the Hero's Party at Ares' request, replacing the banished Gideon. Her "Assassin" divine blessing provides exceptional stealth, allowing efficient target elimination and earning her a feared reputation. She fights alongside her spider familiar, Mr. Crawly-Wawly, who aids in combat by restraining opponents with near-invisible webs.

Her training forged a calm, emotionally withdrawn exterior, concealing her capacity for fear—particularly towards Ruti, whose aura she perceives as terrifyingly dark through her thought-reading skill. This ability also lets her analyze combat techniques and intentions, fostering respect for Red's capabilities despite his modest blessing. Tisse gradually sees beyond Ruti's imposing presence, becoming Ruti's first acknowledged friend.

When Ares betrays the party and sides with demons, Tisse aids Red in confronting him, using Mr. Crawly-Wawly to immobilize Ares and facilitate his defeat. After Ruti abandons her "Hero" role and the party dissolves, Tisse relocates to Zoltan. There, she collaborates with Ruti on an herb farm supplying Red's apothecary and takes adventurer work. She routinely manages Ruti's overpowered actions during mundane tasks to preserve their low profile.

Tisse's relationships deepen in Zoltan; she supports Ruti's adjustment to ordinary life and harbors subtle romantic feelings for her. Her skills diversify to include herb cultivation and retail, though she remains vulnerable to opponents with superior strength or magic. Her development reflects a shift from rigid adherence to her assassin role towards embracing communal life and personal connections.