Mariam

Mariam has a wild spirit, with an even wilder sense of humor. Her sarcasm often gets under Dunga's skin and she rarely lets an opportunity to give him a jab slip by, especially when he's fighting any battle. She is unpredictable, and often leaves her opponents baffled from her unique moves. Her ability to confuse her opponents leaves them vulnerable for attack. She often teams up with her brother Joseph to take on their more difficult opponents. Together, they are a formidable pair. Her bit-beast is Sharkrash. She was so absorbed in her destiny-to seal the sacred bit-beasts-that she forgot about the beyblading spirit.

Only after her battle with Max, did she realize the true spirit of a Beyblader. source: wikipedia