Clearly, Rune knew that he was not a real person with a soul but was, in fact, a fictitional video game character. He acts like the above poster said because he knows he's one of the best damn fictional characters EVAAAR in a video game
I imagine the characters in the game are bit like the characters in the
Star Ocean JRPG series.
*MAAAAAAADDDDD BAAAAAAD SPOILERS*
They, in the game, are fictitional characters in a video game but develop souls somehow that boggles the minds of the coders
Clearly, Rune has done in REAL LIFE what the above mentioned characters did in the game
Rune is watching and playing all of us! WE ARE THE GAME!!!