If it was done that way, it would be perfectly acceptable. But otherwise, ugh. Way to toot your own horn.
A second pet peeve would be not being able to stick to whatever personality they gave a character. I know it's difficult, but some just change how their characters on the fly to fit...
Hyping up your own character by making an extravagant story instead of just RPing it and showing the depth the character is capable.
It's just cringey.