Asskicking Equals Authority: He sets himself up as the drug kingpin in Gotham and rival to Black Mask by showing up at a meeting of the heads of the organizations under Mask's thumb and giving them a bag full of the heads of their lieutenants.
[To Batman] "Yes. You can't stop crime. That's what you never understood. I'm controlling it. You wanna rule them by fear. But what do you do with the ones who aren't afraid? I'm doing what you won't, I'm taking them out!"
The Reveal: Blood analysis shows that he's Jason Todd.
Ms. Li: Understood. We'll be taking further precautions at every transaction.
Mask: Screw that! Time he learned that this is a contact sport. We're going on offense. Rough up his business; something big! Something loud! When he shows up to shut us down, have a party waiting for him! And when I say "party" I actually mean a 'whole lot of people who are gonna KILL HIM!
Affably Evil: He states that he never resorts to violence or killing unless it's for a "greater cause" and is deeply remorseful that his hiring of the Joker was ultimately what lead to Jason's murder; his attempt to fix things via Lazarus Pit resurrection is what sets off the main plot.
The Atoner: After Jason's death, Ra's chooses not to oppose Batman again, and tries to resurrect Jason to try and repair the damage he inadvertantly caused.