It is hard to earn Therru's trust easily, probably due to being abused by her birth parents. She is tough when she needs to be, independent, and speaks her mind. While it takes a while to get to her center, she has a good heart and is very caring towards her acquaintances and any animal alike.
When Cob tries to strangle her to death, he believes to have suceeded and starts walking away until she tells him to stop. Cob turns around, shocked to see that she is immortal. Cob starts hobbling towards her rasping "eternal life" and tries to reach to her as if to take some of her immortality for himself. Before he can reach her, she transforms into a dragon and blows a ball of flame onto him. He catches on fire and stumbles back, triggering the already loose cut stone and falls to his death.