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Quick little rant.
Something I love about the Mob Psycho 100 final is that we can see the concealed sides of both Reigen and Mob.
It's quite obvious that Mob bottles up his emotions throughout the series. Mob is far from an emotionless kid, even though sometimes the fandom (me included) forget he's not passive all the time.
Just like how Reigen is not a level headed all the time.
Reigen can be crude and has used mob for years. Every character in the show has done bad things. Some worse than others, but no character is perfect.
Mob is the person that hurt Ritsu
Mob is the one who rampaged through Seasoning City
It's not some separate identity, not some separate being. This is as much of Shigeo Kageyama as the one who gets flustered talking to Tsubomi. Mob is so much more than a kind vessel of kindness and forgiveness, he's a person and a person with a full range of emotions.
Just like how Reigen has been lying to Mob every day for years, he's the same man who would rather die trying to help Mob than not.
Only in the final episode both of them are able to release themselves of that gilt of doing wrong.
With the realization that expressing your true self without gilt
And the realization that you need to rely on others even if it makes you feel weak
Even after years of trying to hide and minimize that part of themselves, it never went away. It was as much of them as the selves as any other part of themselves is.
At the end of the day, they're just people, not heros or villains.
And you're not a monster for messing up once.
(Sorry if this doesn't make sense! I just wanted to get this out there cause I just love analyzing this show)