As I keep stating, the Kusogame list continues
Most loathed party member turns out to be the end boss all along
To use an analogy, that might be a tad old, but it's like if you had to keep Argath Thadalfus from FFT through out the entire game, and he turns out to get turned into the last Zodiac Brave fight.
I should state for the record, that this is an old, and slightly biased opinion, since I, and all my homies, fucking hate Argath and how we had to have him in our party despite him actively dissing Ramza and our loyal battle buddies.
Another analogy would be... Uh... modern stuff, I suck at thinking this stuff up...
Ah, I got it, if in Persona 5, it turns out that
Yuuki Mishima turns out to be the agent of YHWH that you gotta smite at the end