Getting new fighters..

Hi,

First... I'm sorry I can't speak Chinese mandarin.

And. Ive kind of figured it out that we have to collect 50-110 fragments (depending upon the rarity). But other than that isn't there any other way to get new fighters (even other than buying frags with real time money). I've found out that there are so many cool heroes in the game like the girl with that bird, (again language barrier), I know Lori and some more 2-3 fighters.

After a point of time, I want even more heroes to play and today as I used them new year eve, the craving has increased! (as I've figured out as all fighters were free fr today).