REROLL GUIDE (should you want to, you don't have to):
Don't link your account when it asks.
1. Play the tutorial and the three prologue missions. You'll have 18 orbs.
2. Go to the main screen and click the owl. You'll get 2 more orbs. You have 20.
3. Summon all five units, using 20 orbs.
4. If you like the units, great. Link your account and continue to play.
5. If you don't, either:
---- iOS: Delete the entire game
---- Android: Go into MISC settings and clear data, this will save you 40 MB of download, or just delete the game.
---- Rooted Android: File navigation to data/data/com.nintendo~/ and delete the shared_prefs folder. You only will have to re-download 0.1 MB.
6. Repeat 1-5.
Tier List, but it's a joke. The game is one day old and the 'meta' hasn't formed. These are just impressions from a couple people after glancing at skills.
If you decide to reroll, reroll for either your favorite character or a 5*.