Senshi is the larger, ebil wolf.
Amaya is the smaller wolf.
their relationship is uncle-niece.

normally, Amaya is fearless; she's not fragile, she's amazing at survival, even survival of the fittest. however, Senshi is probably two to three times as powerful as she is - and he suffers from a Psychosis like she does. while he embraces it, she shuns it, thus the 'i will never be like you.' however, regardless, she is deathly afraid of Senshi, because not only is he merciless, but he is more powerful than even her father, the alpha of their now slaughtered pack, who Senshi killed.