Gazi is on the right, Siyamthanda is on the left.
Gazi isn't important to the story until she's an adult, and her brother, Siyamthanda only appears as a cub. So haven't gone into too much detail with their cub designs.

I feel like their anatomy is a bit off because I'm not really good at drawing young characters.

Siyamthanda is the opposite of his sister. He's shy, soft, doesn't talk much, and just wants to understand himself, and the world around him.
Like I said before, he doesn't appear too much, so I'm not 100% sure about his personality, but I'd say he's probably an INFP 9w1