This is gonna be a long one and I still can’t cover everything.
Finn is probably the most original and unique character in the entire sequel trilogy and the way his character arc ( if they even wrote one for him) took place was a slight disgrace.
He was taken from his family at a very young age and trained to be a faceless and order-following no questions asked killer. FN-2187 was his call sign, so he had no name. One day he sees his friend killed on the battlefield and realizes the ruthlessness of the first order when he was asked to murder a bunch of innocent villagers. This mission changed his life trajectory and he decided that he would start a new life by doing a good deed: saving Poe.
No hate to Poe or Rey, but compared to them he had one hell of a backstory.
Let’s look at his relationships with other characters and how he was treated in the series. He found Poe, who gave him a name and a way out of the terror. Then he thought Poe died in the crash, which is a really big loss considering the above factors. He found Rey and BB8, who he decided to help reach the resistance. Keep in mind that he thought Poe was dead, so he could’ve just found another way out. Instead he wanted to fight for the cause. When he found friendship in Rey, he was ready to die fighting to protect her from Kylo.
I think in a way the original plan for the trilogy was for him to be the lover boy but that storyline fell off the train like Bucky Barnes. The man was kind, fair and just despite his upbringing.
We all know he was sidelined and John Boyega does too.
Finn is wasted potential. Back in the day people pointed out that large number of his lines was just him screaming REYYYYYYYYYYYY!!!!!
One reason for the sidelining is probably racism( as said by Boyega himself. Despite being a very interesting character, he didn’t have a satisfying conclusion to his story. His relationship with Rose was thrown away (Rose deserves another rant), and that one plot point in tros where he met Jannah, who was also a stormtrooper that defected from the order, was never explored.
Speaking of wasted potential, there is a deleted scene in TLJ where he confronts and berates Plasma, saying something along the lines of “ When a blaster was pointed to your bucket of a head you screamed like a whoop dog”. Like this dialogue was cut but they kept the porgs and Luke drinking that disgusting milk from whatever that thing was.
I don’t think people would’ve minded if he was the main character instead of Rey (not 100% for a multitude of reasons) because he had a lot of depth and originality to his character, whereas Rey was a tragic desert Jedi like Luke and Anakin.
Note: I just checked on wookiepedia and it says he’s force sensitive?? Not only do you disrespect him by not including that in the movie but you bring it up in a random interview?????