Trooper Cards are a unique mechanic in Like a Dragon: Ishin! that allows you to bring Shinsengumi soldiers into battle with you, providing passive buffs and active skills. They are crucial for Battle Dungeons and can be used in regular street fights as well.

Acquiring Trooper Cards:
- Battle Dungeons: The primary source for new Trooper Cards.
- Sub-Stories: Some sub-stories reward you with unique Trooper Cards.
- Shinsengumi Missions: Completing certain missions can grant cards.
Managing Your Squad:
- Equipping Cards: You can equip up to four Trooper Cards in your squad. Choose cards that complement your chosen combat style and the challenges you expect to face.
- Leveling Up: Trooper Cards gain experience in Battle Dungeons. Leveling them up increases their stats and unlocks new abilities.
- Fusing Cards: You can fuse duplicate cards or specific materials to enhance a card's rank and power.
- Skills: Each card has passive skills (always active) and active skills (can be triggered in combat using the D-Pad). Active skills consume a portion of your Heat Gauge.
Pay attention to the rarity and type of each Trooper Card. Higher rarity cards generally have better stats and more powerful skills. Experiment with different squad compositions to find the most effective combinations for various combat scenarios. A well-chosen squad can significantly turn the tide of battle, especially in challenging dungeons or boss fights.