I'm just wondering, how exactly does someone go about going down into BM history? I'm wondering because I'd also like to get a character to do just that, but I have no idea what sort of pre-reqs there are. What characters have already gone down in BM history?
I say it depends on how many continents you are considered notable.
I, for example, consider the Chénier family to be pretty well-known on Beluaterra. Been there for a long time, did a lot of messy things, messed with people from every realm, achieved many positions, founded the religion that got the spotlight of everyone's attention for so long, etc. And my bag is still full of tricks on that island.
On Dwilight, I can't say. I must have at least a moderate level of fame. Much more localized, though. Nobles from my realm know who I am, those of adjacent realms probably heard my name at least a few times, and so have rulers abroad. I've just hosted a tournament too, this aids, and I'm involved in a few things. But nothing truly big, shocking, or otherwise quite memorable beyond the limits of my own realm.
I don't know how many people outside of BT and Dwi know of my family. Such it is, really, fame is localized. Fine by me like that. And while I didn't look in a while, my family page, user page, and blood cult page had gotten quite a few views on the wiki last I checked.
If you want to be known game-wide, though, you'd need to have 4 active nobles in 4 different continents, probably best if its BT, Dwilight, FEI, and AT or EC. And you'd must be ambitious with them, ready to gamble all the time, not afraid to do shady deals with public repercussions, and participating in newspapers can help as well.