Sif is a shieldmaiden of Asgard.  She is a fierce warrior and loyal friend (and lover) to Thor Odinsson.  Sif is much more than that, though.  Who is she? Read on to find out! Background Sif is the sister of Heimdall (Asgardian in charge of the Rainbow Bridge), and has been the best friend of … Continue reading Marvel Crisis Protocol Lore: Who Is Lady Sif?