In the beginning.
George: JoJo. Where do you think you're going, young man?
Jotaro: Just gonna take Danny out for a walk. Don't get too worried, old geezer.
George: I'M NOT THAT OLD.
Sees Erina getting picked on by bullies.
Jotaro: SHUT THE HELL UP! SCREAMING GIRLS PISS ME OFF!
After beating up the two kids and handing her the doll back.
Jotaro: I only did that to shut you up.
Upon meeting Dio.
Dio: You must be Jonathan Joestar.
Jotaro: Yeah. Don't care about your name.
Dio kicks Danny.
Jotaro: What did you just do?
Dio: I kicked your do- OHK!
Jotaro: I kicked your balls.
Dio beats him in a boxing match with an illegal punch that almost blind him.
Jotaro: You bastard..! *assaults Dio*
Erina dates him and they became a couple.
Jotaro: Yare yare. I only did that so you'd stop whining about it.
Dio stole her first kiss.
Jotaro: Oi, why don't you kiss my fists next?
Danny dies.
Jotaro: I knew I should have bought that goldfish instead.
Plays rugby.
Jotaro: *commits a shit ton of foul*
Discovers Dio's plan to poison George.
Jotaro: Yare yare. You greedy scumbag. *tosses Dio off the balcony*
Kicks Speedwagon in the head and beats the living shit out of everyone in Ogre Street.
Jotaro: Nobody ever said Jonathan Joestar was a nice man.
George dies in his arms.
George: It's not too bad to die in the arms of your own son. *dies*
Jotaro: You're too heavy, are you dead yet?
Dio wore the mask and got shot by cops, only to survive.
Cops: Guns don't work!
Jotaro: Yeah but my fists will!
It didn't work*
Impales Dio through the statue.
Dio: *screams in pain* AAAAGGGHHHH!!
Jotaro: SHUT THE HELL UP!
After a few days he finally regains conciousness and reunites with Erina.
Erina: Oh dear!
Jotaro: *opens eyes and sees her* Yare yare daze.
Speedwagon doesn't see his noble spirit and just follows him around because he is the strongest.
Speedwagon: I will follow you around, Mr. Joestar!
Jotaro: Fine. Just keep your voice down.
Zeppeli awakens his hamon with a punch that healed his broken arm.
Jotaro: *stares at his now healed up arm and punches the Italian with it in the face* ORA!
Sees Jack the Ripper.
Jotaro: Yare yare. Stop picking on whores and fight like a man.
Kills Bruford and inherited his sword.
Jotaro: Huh. Can't wait to try this on Dio.
Receives Zeppeli's final ripple.
Tarkus: This wasn't supposed to happen!
Jotaro: Come here, I want to test out how strong I am now.
Zeppeli died.
Jotaro: You're a good man.
Sees Dio again.
Dio: JoJo! I supposed you won against my knights?
Jotaro: Yeah, too easy.
Dire died.
Jotaro: You stupid shit.
Dio 'died'
Dio: Hamon is... Melting me..! GARBHANFLALAAGHH!!!
Jotaro: Finally- STOP SCREAMING IN PAIN, IT'S PISSING ME OFF!
Marries Erina.
Jotaro: Yare yare. I only did that to stop you from complaining about it.
Sees Dio as a head.
Jotaro: I'm going to play soccer with your head. Come here you son of a bitch.
Gets shot and has no choice but to sacrifice himself to save Erina and to stay behind to restrain Dio.
Erina: JoJo! No!
Jotaro: Whatever. Atleast I don't have to hear you scream.
Dio: Let me go, JoJo! Release me! I can heal your wounds.
Jotaro: Shut the hell up, I'm dying here. *dead*