DLC:
1) Goku w/Naruto's Costume
2) Super Vegito
3) Super Saiyan Bardock
In-game characters:
1 ) Goku
2 ) Gohan
3 ) Kuririn
4 ) Tenshinhan
5 ) Yamucha
6 ) Piccolo
7 ) Saibaiman
8 ) Raditz
9 ) Nappa
10) Vegeta (w/Scouter)
11) Super Saiyan Goku
12) Freeza Soldier
13) Gurd
14) Ricum
15) Jeez
16) Burta
17) Ginyu
18) Freeza 1st Form
19) Freeza 2nd Form
20) Freeza 3rd Form
21) Freeza 4th Form
22) Freeza Full Power
23) Trunks
24) Super Saiyan Trunks
25) Super Saiyan 2 Trunks
26) Super Trunks
27) Super Saiyan Vegeta
28) Teen Gohan
29) Teen Gohan Super Saiyan
30) Teen Gohan Super Saiyan 2
31) Android 19
32) Android 20
33) Android 17
34) Android 18
35) Android 16
36) Super Saiyan God Goku
37) Ape Vegeta
38) Ape Gohan
*not counting the unrevealed*
Spike wasted slots for characters which would've fit under one, in this game it's worse, they're all in-game characters without transformations at any moment.
For people saying that it's impossible, imagine this way: 3 of your buddies fight the enemy and you'd evolve/transform there, that wasn't hard.