I'm a bit off a collector, so i do:

1- collect character/ninja

2- get em new costume/clothes

3- power (so i can mess with em in sage war ^^ )

but the most i miss after 3.0 update is

4- matsuri, i cant 'humble brag' to my opponent lol

p/s - and chat, sometimes the right thing to say at the right time to the right person, can change the game lol