Saiga
Saiga is often seen hanging around in the Green drugstore usually napping, smoking, or both. He also always wears a pair of dark sunglasses which he never seems to take off. Whilst it is unknown whether he has any supernatural powers like the rest of the cast, it was mentioned that he is extremely good at finding things, and is currently working on helping Rikuo find Tsukiko. He is Kakei’s lover and is skilled in “domestic” areas, such as sewing and making food.
In the latest chapter of Drug & Drop, Kazahaya tells Kohaku about how Kakei and Saiga look the same as Hisui and Kokuyo, strongly hinting that they may be their reincarnations.