Awesome Mc Cool Name: Though Star Platinum is a pretty cool name, he still wanted to call his stand "Super Mega Ninja Galvatron Deluxe".
Badass: Despite the abridged series being quirky as hell, he's every bit as badass as in the manga.
Determinator: He refuses to pull a tacky inspirational Inner Monologue during his fight with Dio, and so has to fight him without pause. When Dio drops an oil tanker on him, he forces himself to continue punching at it and doesn't stop until he hits a gas line and it explodes on top of him.
Genius Ditz: Abridged!Jotaro isn't that bright most of the time. However, he tricked both Enya and D'Arby, and he spent a good thirty seconds messing with Kakyoin regarding the pronunciation of Hierophant Green; similarly, he trolls Dio into gaying it up for a minute with a single well-placed question. In general, he's also the quickest to solve problems. He may or may not have Obfuscating Stupidity.
Hello, Insert Name Here: Subverted. He's able to name his stand in the same manner as characters from early Final Fantasy games, but he seems annoyed over the fact that the writers made him name it "Star Platinum".
Deep South: He speaks with a very thick accent reminiscent of stereotypical hicks, and mentions having eighteen bloodhounds and a cousin who had sex with a raccoon.
Eagleland: A type 2— the uber-nationalistic boor exaggerated and Played for Laughs. He says there are only two kinds of languages: American and non-American, and tells Polnareff to "say hi to Trotsky-Hitler-Bin Laden for me!"
Black Comedy Rape: He raped Polnareff's sister before he killed her. Then he dressed her up like Liza Minelli and raped her again.
"I know, I'm fucked up like that."
Dirty Coward: The moment that Hanged Man is destroyed, he tries to beg Polnareff for mercy. It doesn't work. The fact he insulted his sister one last time while apologizing about killing her didn't help at all.
In the original, young Jojo was incredibly strong, athletic, and a good boxer; Dio just happened to be even more skilled. Abridged!young Jojo only throws a single good punch when enraged, and is otherwise a complete pushover and a bit of a sissy.
However, come the second episode, Jonathan seems to have mostly gotten over his inadequacies and in a clear display of strength casually backhands Dio through a railing off a balcony after NOT reacting when Dio sucker punches him, and Dio seems downright intimidated. In the anime, Jonathan had to tap into Unstoppable Rage and took about twice as long to knock Dio down.
Good Old Ways: In a sense, given that he's a Nice Guy who's mannerisms and values are relatively appropriate for his time, while all the other guys his age are douchebags who embrace 21st century memes.
Defeat Equals Friendship: He pledges eternal loyalty to Jonathan after the latter nearly smashes his head in with a kick that was powerful yet deliberately held back. Also because Speedwagon's hat injured Jonathan's arm. Yeah.
When talking about how he likes his wine, Zeppeli even briefly mentions that if anybody, be it normal or "a man with labia flaps as wide as a manta ray" asks him about this, he feels entitled to "lay the smackdown on the bastard."
Groin Attack: Zeppeli is asked to do this to Speedwagon at the end of the comment special. He obliges, especially after he had just learned moments ago that the wine cellar Speedwagon bribed him with in order to stay in the comment special was actually purple tanning oil.