Day 20: An experiment you want Aiba to perform. 

Hmmm...I don't know about anything specific, but anything doing with spinning and running, water, liquid nitrogen, or zero gravity would be good.

Oh, or anything to do with Mirror Man. xD

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Day 21: Your favorite and least favorite solos by each member.

My favorite solos would be  every solo by Ohno & Nino. I haven't really listened to the other three's solos so I have no opinion on that yet.

As for my least favorite...I have no least favorite. xP

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Day 22: Concert goods you'd like to be made.

Do cardboard cutouts count? Lol.

Aside from that...maybe little chibi versions of each member on key chains. (Does that make sense?)