Castlevania (series, special mention for Symphony of the Night)
Chrono Trigger/Cross
Dead Cells
Destiny 1/2
Dragon's Dogma (mainly Into Free, but still...)
Final Fantasy (series, but special mention for XI and XIV)
Persona 4/5
Portal 1/2
River City Girls (probably 2 as well, but still waiting on my LRG copy)
Scott Pilgrim vs the World (the game (the soundtrack))
Tony Hawk (series); a bit of a cop out, as they're all licensed songs
Zelda (series, special mention for the Cadence of Hyrule soundtrack)
And then just a lot of old nostalgia for NES games (Duck Tales, River City Ransom, TMNT, etc) and SNES/PS1 RPGs (Lufia, Super Mario RPG, Suikoden, Thousand Arms, etc)
But that main list contains the ones I either bought or downloaded because I loved the music so much.