Top 3 (in no particular order):

• We’ve yet to see him from the back side, but in his 5* initial card, we can see him sitting and kinda guess.
• I’m literally basing this off his physique and what I imagine his behind to look like: muscular (that’s a given), firm, and round shape.
• Reaction to s/o complimenting his behind: “Someone’s eyes have been wandering lately.”
• Reaction to s/o slapping behind: Stares at you with an eyebrow raised and smirks. “You know what I’m capable of, don’t you?”

• We get a peek at his behind in his and Mokuren’s versus card and in the card above.
• Muscular, firm, and in between flat and round.
• Reaction to s/o complimenting his behind: “….”
• Reaction to s/o slapping behind: Would reflexively go to punch but stop halfway when he realizes it’s just you. “The hell you do that for?”

• Again, we’ve yet to get a peek at his behind, but just like the two guys above, he’s muscular.
• Being the most muscular and a sportsman, he would most likely have the firmest butt and square shape.
• Reaction to s/o complimenting his behind: Too shocked and shy to say anything.
• Reaction to s/o slapping behind: Face turns bright red, and he is speechless.

I I I I….like muscular men and cannot lie.

– – – – – – – – 

Bottom 3 (in no order): 

• Since Heath can’t exercise due to his health and all, he would most likely have the most skeletal behind in Starless. 
• Bone-y but round.
• Reaction to s/o rap dissing his behind: “Oh…okay…” T—-T
• Sorry heath, /throws hearts at him/.
• Reaction to s/o slapping behind: Passes out from the shock. Be prepared to be chased by Mizuki and Ran. 

• Yoshino doesn’t really seem like he likes to exercise/doesn’t exercise (if you don’t believe me, then look at his reha card). 
• Flat and kinda squishy.
• Reaction to s/o dissing his behind: actually, please don’t diss any part of him, he already has confidence issues (which seem to be getting better). 
• Reaction to s/o slapping behind: Nearly gets a heart failure. Can’t look at you in the eyes for a month.

• I’m not targeting the singer, I swear! Kinda makes sense though since they don’t really need to exercise their body as much as the performers.
• Petite, firm, and in between round and square shape.
• Reaction to s/o dissing his behind: for the sake of your life, I suggest you keep your comments to yourself (good or bad). 
• Reaction to s/o slapping behind: Again, if you value your life, I suggest you think twice.