Crowning Moment of Awesome: Hime has too many to list. Hiro, as of chapter 47 is stepping up. Hime gets sent 9 years in the future and that version will inevitably die if he saves the present. What does he do? He goes into undead mode and swears to exceed the future. He then proceeds to do so.
One of Hime's greatest comes in the manga when Kinski believes he has killed her and is en route to procure her blood so that he can continue to live. Upon reaching the mansion, though, Hime, very much alive, informs him that he may notcome in.
Moral Event Horizon: Arguably two - the first being the unknown mage who suggested the legs-for-voice swap to a mermaid, and used her to power his ghost-collecting ship, and the second being when Severin unleashes the Zombie Apocalypse on a town just to kill Hime.
Sylvia's are when she turns Emil into a blood warrior and lets him loose on his former subordinates. She also kills Hime in the Bad Future.
Hime can be more than capable of handing this out. For example, in episode 22 of the anime she and her band capture and imprison three nigh-invulnerable werewolf Blood Knights sent to assassinate her. In order to to remove them as a threat, she she goes into the room where they are being held captive and shoots them with silver bullets again and again until they are no longer able to regenerate. Worst of all, she tells them right off that this is what she is planning to do, and proceeds to commence firing. For most of the night. Wow.
The Scrappy: Hiro is absolutely detested by the fans, who can't seem to stop complaining about him being a useless coward, completely ignoring that he's just a little boy, and even despite this he acts unusually brave, but lacks the superhuman strength of everybody else. Some are willing to go so far as to imply that he's also selfish, and the only reason he's willing to risk his life for Hime is because 1) he knows he can't die and 2) if Hime dies, he loses his immortality.