I couldn't find a thread for him, so I made one.
So, Grindelwald. Before DH, we knew next to nothing about him, except that Dumbledore defeated him and he may have contributed to WWII. However, in DH we learned about his whole background and history with Dumbledore, his belief in Wizard dominance, and his quest for the Deathly Hallows.
There's obviously a lot to explore here. His personality seems very vibrant--he's described as having a "wild and gleeful look about him", and the Lexicon describes him as "wildly brilliant". He was obviously a very intelligent and skilled wizard, nearly on par with Dumbledore. He was probably very outgoing and loud and mischevious as a teen, but obviously had a bit of a darker side. That dark side got him kicked out of Durmstrang, resurfaced during the duel with the Dumbledores, and took over after he fled.
Do you think he was just like Voldemort? Cruel and heartless and pure evil? I'm inclined to say not: he had a true friendship when he was young, and they say he showed remorse in his later years. His obsession with the Hallows seems to have dominated his life, and I think he had potential all along to do some bad things, but I don't think he was inherently evil. He probably truly believed what he was doing was "for the greater good".
What about his relationship with Dumbledore? Whatever your thoughts on the Dumbledore being gay "issue", did Grindelwald truly care for Albus or his family? One interesting thing that most people don't notice is that Grindelwald is actually two years younger than Albus. Albus was seventeen at the beginning of the summer and turned eighteen sometime in July or August; Grindelwald was sixteen when he was kicked out of Durmstrang and "traveled about for some months", there is a possibility that he turned seventeen during this time, so they could be anywhere from about two years to a little less than a year apart (if I have done my calcualtions correctly; but I am horrible with that sort of thing).
Anyway, I'd love to see some discussion on what y'all think of Gellert Grindelwald as a character. I don't exactly have specific discussion questions, but feel free to make some up.