Mostly an OTP. I don’t really feel it in the anime, but any other canon and most fanworks, I love them together. And when it comes to PGSM, it’s the number one ship. I love thinking about what happens after the series, when Rei really gets to see Minako’s playful side. Because when Minako had her dress up as her unicorn mascot, Rei had no idea what was happening. She was too focused on senshi business. A few months after everything, though, she finds out that Minako had the camera men take pictures. Which naturally are now on Minako’s website for all her fans to see. The fallout, of course, would be glorious.