One Piece, Vol. 4: The Black Cat Pirates

Luffy hypnotized!
1. Zoro totally gets duped in this volume multiple times. First by Nami climbing over him on the oil hill and then the Meowban brothers stealing his swords.
2. While Usopp has a lot of understated heroic moments. Covered in blood and taking on enemies. “Eat lead, cats!” lol. And telling his little crew member to take Kaya to safety. Oof.

Enemies defeated: Zoro defeats Siam of the Meowban brothers.