In Yu-Gi-Oh! 5D’s – Tag Force 5 for the PSP, there are several cards you can unlock by completing the story mode with specific characters.
Ancient Fairy Dragon – Beat story mode with Luna
Black Rose Dragon – Beat story mode with Akiza Izinski
Black-Winged Dragon – Beat story mode with Crow Hogan
Chevalier De Fleur – Beat story mode with Sherry LeBlanc
Goyo Guardian – Beat story mode with Tetsu Trudge
Red Nova Dragon – Beat story mode with Jack Atlas
Scrap Twin Dragon – Beat story mode with Poncho Yusei
Shooting Star Dragon – Beat story mode with Yusei Fudo
Tech Genus Blade Gunner MAXX-10000 – Beat story mode with Vizor
Some of these are unlocked with hidden characters, so check out my guide to unlocking characters if you’re missing any.