- Angel/Devil Shipping: Many fanfic writers like to portray Riki as an innocent being seduced by the evil and perverted Iason Mink when Riki is not what one would call innocent.
- Designated Villain: Some feel the story does this to Guy by having him Jumping Off the Slippery Slope so Iason will be favored over him.
- It Was His Sled: The ending is a Twist Ending but due to the popularity of the first OVA series, the ending is better known than the actual details and dynamics of Riki and Iason's relationship and how things got to that point.
- Moral Event Horizon: Kirie intentionally crossed it when he sold out Guy but did Guy do so when he decided to cut off Riki's penis to remove the Pet ring?
- Uncanny Valley: It's easy to forget that Iason is an Artificial Human, untill he rips Guy's arm off. Not to mention the time he made his manhood grow bigger in an enraged state of lust.
- Wangst: Riki. Though he had a good reason to be angsty given his Deus Angst Machina life sucked so much that he only "just" missed a Shoot the Shaggy Dog ending. Would have been one hell of a Downer Ending if things weren't reciprocated.
- What an Idiot!:
- Riki on account of Cannot Spit It Out where the truth was crucial.
- Why Would Anyone Take Him Back?: Riki going back to Iason. Then again at that point it was best he stay away from Guy and wouldn't even amount to furniture.
- Also, at this point Iason has Riki so psychologically beaten down, he's at a point where he genuinely feels there's nothing else left for him.
YMMV / Ai no Kusabi