I'm gonna make this short because I wrote it once already and it wiped it because it had links.
Phantasm Comics:
-Batman & Robin Adventures Annual#1 "Shadow of the Phantasm" - Explains how the Joker survives, and Andrea's new vendetta.
-Batman Adventures #6, 7, 8 (not to be confused with THE Batman Adventures) - The Phantasm returns again, this time becoming a hit-person so that she is paid to kill the underworld. Batman stops her from killing anyone, but she kicks the crud out of Batgirl. She's left laying low under the employ of the Red Hood (which is very interesting considering who that is).
It won't let me post links to Phantasm screen shot pages, so you'll have to check out toonzone's 'worlds finest' Batman section yourselves (hint hint)
Phatams Kills:
- Chucky - Accidental
- Buzz - Only Actual Kill
- Sal - Killed by the Joker
- Joker - Suvived (the movie is part of the animated continuity, so he has to have survived, and "Shadow of the Phantasm" follows the likely scenarios if you need to know how)
And my fav. bit of Batman: MOTP has to be Bruce at the end - cradling the locket...
Oop I missed off the start:
Yes, the Phantasm does deserve her own comic, but the Harley Quinn comic was based on her character in the adult Batman comics - in which the Phantasm is the Reaper, and everything was covered in Batman: Year Two. The Phantasm would be an entirely animated spin-off, which has not been done before and is therefore a scary and horrible concept to any DC comic book team.
The Phantasm characters has been expanded on in various comics - heres a list... (and don't worry - there's no kills)
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I don't know what happened to her after the phantasm incident.
As for why Andrea never went back to Bruce, how could she? She had murdered someone, crossing that line which Bruce would never accept.In fact he may even have turned her in...I don't think he'd ever be able to forgive her.He still does love her though.a lot. After her, he never even tried to hav ea serious relationship with anyone...and it was only her who could shake him off from the path to batman...