First things first: you unlock characters in Yumeiro Yuram by completing achievements. Finishing 60 out of 100 achievements will nab you the full roster. Booting up the game 10 times is an achievement.
With that said let's go over the abilities!
Yuna (main character girl): Her drop pool contains a much higher rate of double pieces.
Noella (trans hair girl): The preview window shows the next 5 pieces instead of 3.
Merrier (eyepatch girl): Whenever you score a yaku, opting to continue play instead of cashing out will give extra points.
Gabu (Cool Dinosaur): Ignores the 25k score cap. Kill him before a full spread with I-blocks across the top deals like 80k lol.
Talto (Cat): Gain extra points every time a drop forms two tetrominoes instead of one.
Viper (Tapir with a sleeping cap/maybe a Baku): Whenever you deal damage to your opponent, gain a quarter of the score you dealt as health for yourself. This can exceed the starting HP amount.
Captain Mokko (Sheep): Whenever you take damage, the amount is reduced by half of what your score was.
Gone (Faceless incubus): When the opponent cashes out a board, you always have 3 turns to play as a minimum.
Alief (Unicorn/Narcissist Pony): Gain extra points whenever you hard drop instead of soft drop. Y'know, that thing you always do in this game anyway.
Jeera (Whale): Her drop pool contains a MUCH higher rate of blue pieces.
So far online I'm seeing a lot of Merrier for the higher value on fast plays and Gabu players looking for those big gambles. I think Yuna and Jeera are going to pop up more as the game goes on since they have greater build versatility. Need to test how much your base score multiplier impacts Alief's score averages.
