Adventures of a Tiny Hero was Teppen's fifth expansion. Released in July of 2020, it added the fifth post-launch hero, a Felyne who teams up with Nero and Nico after his village his destroyed by Nergigante. The card set focuses on the Felyne's journey to be a true hero, as well as all the strange characters he meets along the way. While there was no new ability added, it did on the pre-existing "Tribe" mechanic, tribes being the associated "type" a Unit Card can be. Many of the cards in this set gain buffs, give buffs, add cards to your EX Pocket, and so on, as long as you've got the proper tribe cards associated with them.
Series and characters included as Unit Cards in this expansion
- Darkstalkers: B.B. Hood, Q-Bee, Huitzil, Sasquatch, Victor von Gerdenheim
- Devil May Cry: Nero, Lady, Nico, Trish, Fury, Frost, Blade, Beelzebub, Damned Pawn, Damned Rook, Damned Knight, Damned Bishop, Damned Queen, Damned King, Nevan
- Mega Man X: Cannon Driver, Snow Slider, Rush Roader, Chill Penguin, Frost Walrus, Flame Hyenard, Bamboo Pandamonium, Crescent Grizzly
- Monster Hunter: Felyne, Grimalkyne, Melynx, Rathian, Great Wroggi, Volvidon, Banbaro, Congalala, Akantor, Shara Ishvalda, Beotodus, Kulve Taroth, Namielle, Velkhana, Great Girros, Anjanath, Zamtrios, Odogaron, Morudomunto
- Resident Evil: Chris Redfield, Sheva Alomar, Josh Stone, Wasp, Giant Moth, Plant 42, Adjule, Zealot, villager Majini, Indigenous Majini, Kipepeo, Ricardo Irving, Ndesu, Excella Gionne, Popokarimu, Executioner Majini, Verdugo
- Street Fighter: Rufus, Necro, Karin Kanzuki, C. Viper, Balrog
"Adventures of a Tiny Hero" contains examples of:
- The Cameo: Rufus' girlfriend Candy appears behind him in the full art of the "Bombast" (ATH 045) card.
- Cult: The Zealots from Resident Evil 4 have formed one around Nevan and can be seen worshipping her in the '"Return of the Heretics" card (ATH 100).
- Chess Motifs: All of the Damned Chessmen from Devil May Cry 3: Dante's Awakening were added in this set.
- Non-Human Sidekick: This expansion and Felyne's Story Mode establish them as one to Nero.