The first two I'm pretty sure are just coins meant to be NPCed for some credits.
I have no idea what the third one is. How did you even get it?
The third one summons a boss that attacks once. It comes from the training dungeons.
This is what I heard, but I haven't tried it myself.
Yuichan - Lv47 Seulbi
Yukinochan - Lv40+ Yuri
Hachimankun - Lv40+ Seha
Zaimokuzakun - Lv40+ J
Saikakun - Lv30+ Tein
(May play English/Chinese Closers in the future, just entered the JPN version for fun lol)
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