Tybra the shark

(a alternate universe warhammer 40k where the space marines and the emperor are female) Tybra is big even by space marine standards. She is the calculated and intimidating Chapter mistress of the Carcharodons space marines, a fleet base chapter that patrols the void between galaxies with no planet to call home. They defend the empire from the terror between stars and can be centuries before another imperial unit encounter them. Tybra and her Carcharodons are unnerving to other imperials as they can be silent one minute and savage once engaged in battle. Also doesn't help that she pale as the void and her smile show very pointy teeth. Her perfered way to conduct combat is to deliberately charge the enemy in deathly silence and rip with her chainsaw fists. (and smiling while doing it). Story: the Carcharodons fleet has come back to imperial space for resupply only to find the badab system is in civil war for 10 years . She chose to side with the loyalist even though they fear the Carcharodons