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Just reread the book, and anyone who says Steve Randle is barely character is lying or didn't read the book. He's not the most developed character but we know so such about him.
He dislikes Ponyboy but loves Soda, letting him comfort him and never fighting with him. He's got a violent temper. He snaps at Ponyboy when he kept prodding the topic of Sandy leaving became it was upsetting Soda. He says he fights for hatred, to give back to the Socs the hurt they cause them, to genuinely hurt them. He's even compared to Bob, that if Soda had died then Steve would've kept on fighting and hurting while Soda (like Randy) wouldn't have.
He generally is a bit snappish, even with the others. He's mentioned to have cried over Johnny and Dally (like of course everyone grieved and cried but it's interesting that Pony notes him crying on three seperate occasions, while none of the others were mentioned crying).
He's also sarcastic and blunt, sometimes a little insensitive in his humor (called Darry 'no brains and all brawn' which upset him). He can sometimes give off the impression that he doesn't care much (Ponyboy is surprised Steve ran to find Dally when they got that phone call). He hates his dad because they have huge arguments where he kicks him out for a week and then gives him some money to make up for it. He's scarily good with cars, both at driving and fixing them.