Best Xmas Unit for TT

If you weren't intending to summon anyways, don't do it just to have a bonus unit. Grab W.Cecilia, who's a reward at 5000 points, just keep her around until you get the 5* version at 15000 points, then level her to 40 immediately (with crystals and shards, if you want)

If you have the 2x ally boost, do a single Lunatic Team 4, Battles 7. Use your strongest team and try to beat it without any of your units dying. It should net you a score of 1500-2000

4 star W!Cecilia is unlocked at 1000, so you can easily grab her after that first run.

Winter Robin is probably the best unit to get the job done the quickest; Innate Armor March and Brazen Atk/Spd makes him great at clearing the map quickly and easily. I still regret killing mine off last year for Brazen Atk/Spd :^)

It really all depends on which characters you like or skills that you want. If you really don’t care then just get the unit with a skill you want to transfer and after the trials end fodder them off