This is a silly question, but how do you raise a 4 star to a 5 star? The game mentions it in the tutorials but I'm not sure what item I need. I want to upgrade Niles. Actually besides orbs, I don't know what any of the items do. lol
I also got Ryoma and Zelgius without trying, but I still can't get anyone fun from the New Years event.
The unit you want to promote will need to be at least level 20, then you can go to Allies > Advanced Growth > Unlock Potential. For 4* to 5* you'll need 20,000 feathers and 20 great badges of their unit colour, so it's quite costly.
February is looking like it has a lot of nice content coming. There's another mini TT starting on the 30th, so many orbs. This is great, and I'm excited to see what the next CYL units will be. I don't see any mention of a new mode though, unless they intend it to be an anniversary surprise announcement. I feel like we need another mode to work on in between the gauntlets and TT's.