What is the thing that attacks people when they turn around? How was Rohan able to outpower it when every other character can't?
all Rohan did has make Koichi fly backwards out of the hands reach, he didn't over power it, he just came up with a quick solution to get Koichi out of it
What was the point of Joseph, Tony, and Yukako joining the chase for Kira when none of them contribute?
Tonio and Yukako live in the town, they don't want to live in the same town as a serial killer so even the can't do much they try to help, Joseph mainly there cause he wants to help josuke out
Did Rohan even do anything the last few episodes or was Araki tired of having to deal with his op powers and decided to cripple his effectiveness?
same reason Jotaro didn't do much, the fight was between Josuke and Kira and no one else, also Heavens door might not work on Kira
How come bites the dust is so convenient for Kira, but Koichi gets a stand that was worthless when he fought Okuyasu's brother?
the arrow works in bizarre ways, it tends to give people the exact power they need, Kira needed a way to keep Hayato from telling people who he is and he got. as for Koichi, Koichi wasn't meant to survive the arrow, the only he did was that josuke healed him but he was still underdeveloped so his stand was usless
Same thing goes for multiple stand users including invisible baby,Super fly, cheap trick, Enigma,Tony, Cinderella.
no every body got there stand from the arrow, as people early in the thread pointed out Tonio got his stand from traveling tthe world and learning about cooking, as for other people. Cheap trick was the case of the stand user being to weak and not being able to control it, Super fly is also another self hurt stand and the user just got unlucky and highway star is another good example of the user getting a power they need, Yuya needed a way to heal his wounds and he got that in a stand
How come Yoshikage's father has a stand ability that is never used again while he is a ghost? Ghosts can have stands now?.
Yoshihiro stand is that it lets him live in the photos after he has died, it might not have even worked till he died, if your talking about what he did to the josuke and jotaro,he was too busy going around stabbing people with arrow, also he would need a Polaroid camera in other to use his ability to it's fullest extent and i don't know how common those were in 1999