An anti-pairing I've noticed after some small moments of observation:
Mayuyu vs Acchan.
Here are the examples:
- They had to compete against each other in the Janken tournament, a matchup that is highly publicized.
- Mayuyu has stated before that she wants to be the center of a single (CG Revolution), a position that Acchan (usually) holds.
- In the unit shuffles, Acchan has taken the center position in two of Mayuyu's songs: Zannen Shoujo and Pajama Drive
- In the AKB Kyuu Gourmet Stadium episode where Acchan cooks, she does an impression of Mayuyu (which could be seen as insulting).
- In the new segment of the Fast Word Battle (the quick drawing one), Mayuyu proceeds to draw the Tokyo Tower, and Acchan is the only one in their group that didn't understand what the picture was and instead just colored (scribbled down the center) the drawing in instead.
That's all that I can think of right now.