Groups
- marutori 1
- marutori corp 1
- marutori no chazuke 9
- marvelous grace 28
- marvelous zents 7
- mary no yamai 18
- marys boy 2
- maryyy 1
- marz 2
- masa no yu 2
- masago 3-chome 7
- masahiko private academy 15
- masamune 8
- masamune kokichi 114
- masamunedou 7
- masaoyan 8
- masaru-tei 5
- masatsu shoukai 1
- maschera nera 1
- mascot boy 3
- mascot club 2
- masheri 2
- mashimaru soft 1
- mashimin koubou 27
- mashira dou 65
- mashira no gotoku 1
- mashiro no hihoukan 39
- mashiro tamago 1
- mashomaro 17
- mashou zoku 1
- mashumaro hibiki-dan 2
- maskdo 16
- masked bros. 5
- masmenos 3
- maso pink 3
- masochist high 14
- masop 2
- masquerade 5
- massala 12
- massaratou 57
- massel 4
- masshiro club 2
- massrao 4
- master h 1
- master k 1
- master mind 1
- master piece 4
- master volume 48
- master-random 21
- mastermind 15