Kokichi and Fuyuhiko.

Teruteru and Korekiyo.

Chiaki and Himiko (I think?).

Leon and Shuichi.

Makoto and Nagito.

Hiyoko and Kirumi.

Byakuya and Monodam.

Kyoko and Kaede.

Hifumi and Kiibo.

Kiyotaka and Monotaro.

Gundham and Ryoma.

Hajime and Rantaro.

Kazuichi and Kaito.

Akane and Miu.

Sayaka and Tsumugi.

Yasuhiro and Gonta.

Ibuki and Tenko.

Nekomaru and Monokid.

Sonia and Monophanie.

Do with this information what you will.

Some of these might be wrong-