Dimension 20 nominator here! It's my first time nominating in this fandom so I checked on how other exchanges handled the different storylines. I'm good with either splitting it into the various seasons (to gain more relationship slots e.g.) or keep it as one (the characters/relationships are distinct enough to match on). If no other participant is nominating in this fandom or has a preference, I'd tend towards splitting for extra ship noms :)