Should see some of the insanity I've done on save editing. One play through starting just before the dance of dragons, then every 20ish years creating a brand new game and transferring "Important" characters from the previous scenario save into the new scenario save along with editing title histories. By the time I reached the modern era there was like 500+ characters.
4 new branches of House Velaryon (Jacaerys, Lucerys, Joffrey, Addam)
6ish new branches of House Targaryen (Aemond One-Eye, Daeron the Daring, Daeron the Young, Baelor Breakspear, Aerion Brightflame)
Houses Blackfyre and Bittersteel
Yeah like 500+ Characters, and about 96 dragons in total haha ugh.