If you don’t know her yet, she’s my OC, Scarlet, the younger sister of Thundercry. She’s a carefree and loves her brother very much. Smart, kind and mature, only to get goofy and act childish once his big brother has a prank or they’re walking together somewhere.The two of them are inseparable.
 
She actually passed away because of a storm and they were attacked by creatures when she and Thunder were flying on a wide ocean.  
Thunder, was wracked with grief. All his cheerfulness and jolly personality immediately faded when he never saw his little sister’s face ever again.  
This is the reason why I always draw Thunder on a grumpy way :)