Noriaki Kakyoin is the first major boss to be encountered in the game, and the fourth party member to join the group.
A Japanese student hired by DIO, Kakyoin is the first assassin commanded by him to fight the Joestars. In order to do so, he assaults both you and Jotaro inside of your school in Japan, possessing a nurse with his Long Range/Control stand "Hierophant Green".
It's after this battle that you join the Joestar Group. Marking the first step in your journey with them.
After being defeated and having his (DIO's) flesh bud removed, Kakyoin also becomes a major ally of the Joestars.
Notably, he is one of two characters (along with Jean Pierre Polnareff) who can join the player when they have high enough FP with him during certain Betrayal endings
Attack Pattern and Strategy
|Kakyoin||170||19 (S), 30 (M)||40 (S), 60 (M)||Crazy DX (S), Darbitol (M)||Kakyoin is much stronger than the regular enemies around Japan, but he is also the first enemy fought with two characters.
The first phase is against the nurse. Inflicting any damage will automatically end the fight in defeat, but the battle will end through the story at the beginning of turn 3.
In the second stage, Kakyoin has two attacks. Hierophant Barrier damages both party members, while Emerald Splash damages one. Party-healing items are nearly non-existent, so things like Ointment will have to do. Jotaro will almost certainly inflict more damage than the player character. If you've made it to level 5 or so, the battle shouldn't be difficult.