Plex - One Piece Mini Big Head Vol 2 - Chapter Alabasta Fierce Fighting

This is my first purchased of the one piece mini figures called the Mini Big Head manufactured by Plex. This is the Vol 2 where Luffy (the lead character) with his other comrade facing one of the Seven Warlords and his geng. Sadly this box is officially sold as box of 20pcs which randomly pack by manufacturer where you cannot be getting all types (24pcs+a secret). The missing character for this box is Luffy, Zoro, Nami & Sanji. I wonder where can i find them...Anyway here's the list of 4 volume that has been released and the latest volume that just available for pre-order not long ago.

One Piece Mini Big Head Vol 1 - Chapter To the Grand Line
One Piece Mini Big Head Vol 2 - Chapter Alabasta Fierce Fighting
One Piece Mini Big Head Vol 3 - Chapter Sky island
One Piece Mini Big Head Vol 4 - Chapter Water Seven
One Piece Mini Big Head Vol 5 - Chapter Ennis Lobby

Here's the character line up for this volume 2.

1. Luffy
2. Zoro
3. Nami
4. Sanji
5. Usopp
6. Chopper
7. Vivi
8. Carue
9. Portgas D. Ace
10. Miss Wednesday (Vivi)
11. Mr.8
12. Nefertari Cobra
13. Pell
14. Chaka
15. Crocodile
16. Miss All Sunday (Nico)
17. Mr.1
18. Mr.2
19. Mr.3
20. Den Den Mushi
21. 海軍船 1
22. 海軍船 2
23. 海軍船 3
24. Monkey D. Dragon
25. (secret)

Every vol contain 20 different pieces

Comparison with Bandai The Seven Warlords of the Sea

Can be combine from 2 into 1 like below picture^^

Can combine from 3 into 1:)