now that's an interesting question. I was never really a kid who would listen to albums when I was younger but I would weirdly get obsessed with a couple of songs on a bunch of different ones and would just sit and switch albums in my cd player at the time.
But some of the more important ones for me are, Attero Dominatus by Sabaton, Black Album by Metallica, killers/number of the beast/Piece of Mind by Iron Maiden and Crimson Thunder by hammerfall.
There are a bunch more albums songs and artists that were formative for me but these were some of the more important ones from when I started to branch out from listening to what my parents and older brother were listening to. But I will also say that I'm hugely grateful to my brother and step brother because without them I wouldn't have discovered things like nu metal or emo music for that matter.