spider man's first is appearance is in amazing fantasy (i dont know the issue number) and it was created by stan lee.
and the first spiderman film was created by sam raimi. the reason why it is dark because the death of his uncle made him angry, vengeful and bad which showed up in the third movie.
the qoute "with great power,comes great responsibility" made peter encourage him became spiderman. and he found out the suspect of his uncle's death sandman (a.k.a. flint marko) made him show his true colors. and in the third movie it made him more dark in the symbiote suite.
and on the third movie he came to harry's house coming for revenge in the night where he almost lost the ring and the only true color of spiderman is angry and vengeful.