They're not unlockable characters, I have 100%, here's the full characters list...
All Characters/Fusions/Reincarnations
Here's a list of all the Characters/Fusions/Reincarnations
available for this game.
1. Goku
2. Picollo
3. Krillin
4. Nappa
5. Tien
6. Raditz
7. Kid Gohan
8. Yamcha
9. Kid Goku
10. Teen Gohan
11. Gohan
12. Vegeta
13. Trunks
14. Kid Trunks
15. Goten
16. Supreme Kai
17. Hercule
18. Videl
19. Captain Ginyu
20. Recoome
21. Android #16
22. Android #17
23. Android #18
24. Dr. Gero
25. Cell
26. Cell Junior
27. Majin Buu
28. Super Buu
29. Kid Buu
30. Dabura
31. Broly
32. Omega Shenron
33. Bardock
34. Saibamen
35. Frieza
36. Cooler
37. Uub
38. Great Sayaman
Fusions
1. Gotenks
2. Vegito
3. Gogeta
4. S.S.4 Gogeta
5. Kibitoshin
Reincarnations
1. Majin Vegeta (Babidi's Mind Control)
2. Mecha Frieza (Frieza's Spaceship)
3. Metal Cooler (Cooler's Spaceship)
And about the world tournament thing, that's not true...
Sighs...