(NOAH) "What A Day!" ~ Atsushi Kotoge & Naomichi Marufuji's "Correlation Chart"

Heavy smokers
Nioh, HAYATA & YO-HEY

Single men
Kaito Kiyomiya, Junta Miyawaki, Yoshinari Ogawa, Kenoh, Hideki Suzuki

Yoshinari Ogawa apparently was a Tokyo playboy in his youth
Hideki Suzuki, as a lot of fans have pointed out, is married (I think this is probably the humor of Marufuji and Kotoge combined)

Harada's Butcher Shop Gang
Daisuke Harada, Chris Ridgeway, Haoh

Pet owners
Takashi Sugiura, Kazushi Sakuraba, Akitoshi Saito, Yoshiki Inamura, NOSAWA Rongai, Hitoshi Kumano

Dogs: Takashi Sugiura, Kazushi Sakuraba, NOSAWA Rongai, Hitoshi Kumano
Cats: Akitoshi Saito
Lizards: Yoshiki Inamura

Nerds
Go Shiozaki, Naomichi Marufuji, Kotaro Suzuki, Kinya Okada, El Hijo de Dr Wagner Jnr

Muscle monsters 
Seiya Morohashi, Kazuyashi Fujita

Cooks
Hajime Ohara
Masa Kitamiya
Masaaki Mochizuki

Mahjong
Katsuhiko Nakajima, Mohammed Yone, Atsushi Kotoge, Tadasuke

Chews tobacco (?) 
Masao Inoue

Wrestlers whose wives were wrestlers 
Minoru Tanaka
Shuhei Taniguchi