I really like how obvious the theme of Happy Around is.

DJ/001B-013 RR 何にでも興味津々なお嬢様 麗 Curious Elite Girl, Rei
Cost 4 / D4DJ / Happy Around!
ATK 5
DEF 6
[ACT](Entry)[ReCombo “Pop◎Coffee Cup“][Skill Showcase Level 5][1/Turn]:[Rest (1) Energy], choose two of your opponent’s members, and put them into the waiting room.
[CONT](Entry):If your opponent has an open member area, this character gets +1/±0.

DJ/001B-092 Pop◎コーヒーカップ Pop◎Coffee Cup
D4DJ / Power Rebirth
[CONT]:Your entry gets +2/+3.

DJ/001B-015 C 特技はクラシックピアノ 麗 Specialty is Classic Piano, Rei
Cost 2 / D4DJ / Happy Around!
ATK 3
DEF 4
[AUTO](Member)[Skill Showcase Level 4 <Happy Around!>]:At the end of your turn, if your opponent has an open member area, you may return this character to your hand.

Source