#the freaking HAMSTER knows more about Saiki's personality than most of his friends. doesn't that make you want to eat drywall??

[no-psi-nan]

How Saiki wants to be perceived:

Not at all. He's just generic mob character #7536, thanks.

How Saiki's friends perceive him at first:

Projection Central... Depending on the person, he's a scaredy-cat, romance novel protagonist, former punk, flustered fanboy, a slacker who just needs some inspiration to become a sports star, etc...

How Saiki's friends perceive him at the end of the series:

Quiet, a little glum, kinda boring, but a good guy. Says "good grief" a lot.

How the Psychickers perceive him:

Sarcastic, stubborn, tsundere, a little childish, back-talker supreme, confident, a bit arrogant even, incredibly intelligent, lonely, silly, uptight, a soft touch, kind.

How Saiki ACTUALLY IS:

Sarcastic, stubborn, tsundere, a little childish, back-talker supreme, confident, a bit arrogant even, incredibly intelligent, lonely, silly, uptight, a soft touch, kind.

-> Only the Psychickers (and to some extent, his family) know and appreciate Saiki for who he actually is by the end of the series.

That's because Saiki is only ever comfortable revealing his true personality once the other person knows about his powers.

Until then, he will always try pretending to be a passive nobody, unless he thinks it can get a girl off his back (ex. against Teruhashi at the arcade, against Imu in the locker room).

Saiki remains nervous about telling his friends about his powers despite seeing it go off without a hitch in the alternate universe, and despite losing his powers first, because his friends might not like his "new"/actual personality.

We see early on in Kuboyasu's introduction that Saiki fears his relationships with his friends are fake because they're based on a huge lie and an even bigger pretense. We see that anxiety about his personality/persona not being palatable enough at the wrong-day birthday party. We see him mourn the fact that he can't be his real self at the mixer.

THAT is the great tragedy of Saiki K, that almost none of the people he loves actually know him in any meaningful way, not even by the end of the series!