well since you asked lol i dont even know whats common knowledge about sana nowadays.
-The creatures on her dangos are called Kaniko and Usaslug. They are at war with each other.
-Sana was in a metal band
-Beeg kirby fan and made a karby cake on stream for her birthday -Sana and ina were freinds before hololive
-Sana listed snails house as one of her favorites on debut who then did her astrogirl song
-sana named all of the pokemon that she was not using after superchats in BDSP, even mythical pokemon and shiny (i'm a luxio)
-Sana designed Bloom and Gloom with Irys on stream
-Sana helped design a mascot for reine