My current inclination is to just pick a character that I think could contribute to the story after everyone else has chosen their desired characters.  On the other hand, it doesn't quite look like the current trajectory of this interest check is picking up the nine-ish members that it looks like you were fishing for with the premise (assuming that one person plays each role, which might not be the case since you mentioned that players were allowed to play multiple characters if they could handle it [I'm not confident in my ability to handle multiple major roles]) so it looks like I will likely be taking on at least one of the Guardians.

I do have some questions about this setting that I'm not super clear on.  It seems to me like you are implying that the tradition of having three Oracles supported by two Guardians each has been a thing for quite a long time, like maybe a hundred years at least.  If this is the case, does that mean that the original three Oracles chosen by the three main gods are the very same Oracles that we will be playing as or interacting with (and therefore that Oracles are immortal) or have the offices of the Oracles experienced turnover since the time when the corrupted gods were sealed?

Additionally, the rituals for picking Guardians (the Rite of Choosing) appears to be well established, obviously implying turnover for the position of Guardian.  What I'm not quite understanding though based on the provided information is how frequently this ritual occurs.  In other words, do Guardians serve for life (or at least until they choose to retire) or do they serve for established terms (say, 10 years).  If the later, does the Oracle replace both of her Guardians at the same time, or does she stagger the replacement time for each Guardian?  Also, do all Oracles replace their Guardians at the same time, resulting in one significant Rite of Choosing every decade, or, going back to lifetime service, do Rites of Choosing get scheduled whenever a vacancy for Guardianship occurs?