One Piece, Vol. 5: For Whom the Bell Tolls

Usopp continues to be a hero. Lying bloody and the ground, the risk of death near and only caring about the kids and Kaya escaping. This leads to a great moment when Zoro and Usopp are running after Django, and Zoro throws his sword to cut down a branch that's blocking Usopp's sniper shot that defeats Django. So great.
Assistant Chef Sanji is introduced. Actually I'm always surprised how he's introduced. He just destroys Ironfist emotionally and bloody for disrespecting food and hits on his girl. So like, the majority of his personality. He then feeds pirate Gin from Krieg's crew and Luffy decides to make Sanji his cook.

Enemies defeated: Zoro defeats the Meowban brother Butchie. Usopp defeats Django!! Luffy defeats Klahadore (or “butler” as Luffy calls him). Sanji defeats Lt. Ironfist Fullbody Minister of the Navy.

Friends made: Going Merry! Zolo's old team Yosaku and Johnny the bounty-hunters. And by Luffy standards Sanji, and Chef Zeff.