My random headcanon is that Alastor's favorite musical is Annie (and this also ties into his love of Christmas). Nobody expected him to have interests outside of murder and aren't quite sure what to make of it.
Like I am just imagining that it's his turn for movie night and everyone was expecting him to put on the most gore filled slasher film imaginable meanwhile he's just kicking his feet in excitement and this is almost more weird to them than if he put on a Saw movie or something. Especially as it slowly dawns on them that he is not playing a bit and is 100% genuine about loving it... Except for Charlie who is immediately just as invested and is happy to be supportive of his non-murdery interests.
(I also like to headcanon that Al spent some time as an orphan after his mom died, so "small orphan child is adopted by rich man and they live happily ever after that's it nothing bad happens no abuse just wholesome adventures" is kind of a wish fulfillment fantasy for him but he'd never admit that even to himself let alone others.)
It is so funny that you say that because one of the core inspirations for Alastor’s character was the song ‘You’re never fully dressed without a smile’ from Annie.
Viv used it in a voice Headcanon video for Alastor way back in 2015. And she even found Amir by finding a bootleg of him singing it on YouTube.
So I absolutely think it’s very fitting for the musical that played a part in his character to be his favorite!












