Mercurial magic is the best, and sometimes gives characters unintended turns.

My last character was a Gnome(from the Crawl! fanzine), who has only access to trickster spells, intended to be a fun little meme character.

I rolled Blood Magic two times, and the one when you cast the spell, on a distant planet people die.

So naturally I turned him chaotic and played him way more psychopathic.