Persona 3 Reload: Every Boss Ranked From Worst To Best
2. Jin
The rematch with Jin is, ironically, much better than the one with Takaya, as he serves as an inverse of the Emperor and Empress fight.
Jin will use his Persona's ability to scan your party for their affinities, and attack based on their weaknesses. While Fuuka can do the same to him like any other boss, this immediately puts you and Jin on an even playing field.
It's a pretty straightforward boss after that, but it's phase two where it gets properly difficult. Realizing that he's a dead man either way, Jin uses the ability Potent Stim Injection to give himself a massive health and damage buff, with the trade-off of his defense being cut down to basically nothing, and taking damage at the end of his turns.
The phase is difficult, but not very long, as your damage combined with the potent stim injection taking over 1000 HP with every turn, puts Jin down pretty quickly. But that damage buff is no joke, and he can take you out if you let that make you careless.
The rematch with Jin is a tough but fair fight that closes the book on Jin and his incredibly silly haircut.