>>281738037
Sexy Commando Gaiden: Sugoi yo!! Masaru-san (Issue #52, #9, #18, #35, #41, #1)
Hoshin Engi (Issue #28, #43, #47, #2, #27, #35)
I"s (Issue #19, #26, #36, #42, #47, #20)
One Piece (Issue #34, #46, #50, #17, #26, #29)
Seikimatsu Leader-den Takeshi (Issue #33, #45, #8, #27, #39)
Hunter x Hunter (Issue #14, #24, #36, #49, #22-23, #25)
The Prince of Tennis (Issue #32, #51, #8, #17, #30, #38)
Naruto (Issue #43, #7, #14, #26, #43)
Eyeshield 21 (Issue #34, #49, #3-4, #14, #21, #34)
Toriko (Issue #25, #36, #48, #10, #20, #29)
Assassination Classroom (Issue #31, #48, #15, #19, #32)
Ichi the Witch (Issue #41, #3, #15, #27, #39)

6 covers seems to be the pretty much the limit for as much a manga can get as far as i searched at the moment, anyway, is very impressive how Ichi was able to pull 5 covers in a year, it took 13 years for a new series to do that again, but we're 17 years since Toriko got 6 lol