Gintama x MonHun: the Death Rhythm

Kawakami Bansai from Gintama & Garara Ajara from Monster Hunter series

Bansai is with Garara Ajara, cuz this serpentine dragon’s attack represents this assassin of Kiheitai IMO 

Garara attacks with mostly sounds - like high pitched roar, or creating deafening sounds by rattling its body plates+scales, it can also shoots out the scales in its tail that will explode when expose to the vibrations created by its rattling tail - which can stun the hunters; beside that, it can also slash/slap at the hunter with its tail, or constrict hunter with its long body, n will bite hunter who tried to escape it grips which paralyses the hunter

so IMO, Garara does represent Bansai’s attack pattern, the rattling tail equals to his shamisen, the slashing tail equals to the katana hidden in it, & the way it constrict hunter equals to Bansai when he uses the shamisen’s string to stop his opponent's movement ;D

in the other hand, i know that in the anime Bansai hv unnatural hair color which matches his clothes, but in the manga (esp shown in the cover of vol 19), Bansai is shown with pitch black hair n clothes, so i decided to color him with the colors that in-between the vers. shown in both the manga n in the anime ^^

also, re-using title, since i still think death rhythm for title fits Bansai