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If bianca lives I want her to somehow or the other be there for nico, as the over protective older sister
Examples include,
the battle of manhattan/the final battle, and Nico arrives with the skeleton army, and the 3 gods, and bianca is just like, "well little brother you may be 12 now, but you'll always be my little brother"
When Nico revives Hazel ( in this au, he is trying to revive his mother), bianca and hazel talk, (hazel is 2 years older than bianca and 4 years older than nico), they debate who is actually older, but eventually they just bond over making fun of nico for being the younger brother
For the labyrinth thing, in this version nico is just outcasted and/or ostracised by the camp so he runs away and is found by Minos, it follows a similar plot as the actual book, but this nico is not bitter, he just thought minos was a genuinely nice/helpful ghost and was helping him, but when bianca finds out minos manipulated nico she goes beserk (nico is still the ghost king tho),
after the tartarus and Jar incident, she is mad at the 7 (minus hazel) for ever doubting her brother
then when nico almost fades after the athena parthenos incident, she's mad at reyna + the seven, but does eventually forgive them, but not forget
and after he jumps into tartarus a second time, she doesn't even know who to be mad at, she's just mad at both of them
Now, I'm imagining everytime she wants to find Nico she digs her hand into a shadow and pulls out nico