I'd like to know too. Maybe from mission/seal and before i knew i had main frag.

Mainly from the daily missions, and from seal treasure and survival trials, but they are super rare.

hum.. well that seems a little vague.. I've been playing every day for about a week and have six 2** star characters and two 3*** star and have yet to get more than 6 Main Character Fragments. I think we're missing something.. :L

Clear 2 Elite Instance to get 4 Main Character Frags from Daily Mission.

3 times to complete.

Thanks Overmain

You can check this site on how to get fragments.. :lol
http://twinfinite.net/2016/07/naruto-online-how-to-get-ninja-fragments/

From this site above my post..
One of the ways to earn Fragments is simply by playing through the story. You’ll earn rewards for clearing an instance and these tend to include Fragments for one of the major characters of that instance’s story. For example, the first instance earns you Sakura Fragments, and the second one earns you 30 for Haku.

Another way to earn some Fragments is through the 7 Day Pack. Every consecutive day you log in, you’ll earn rewards, and for the second day onward, you’ll earn Fragments for numerous Ninja.

He's referring to his Main Character.