"It's like... a guardian, I guess is closest. I don't think it translates very well into human language," Terezi said, stumbling a little even with the automatic translation charm. For all that humans were ridiculously simple in the romance department, they seemed to have a lot more varieties of familial relationships than trolls did. "Where I come from the adults aren't around most of the time, so most kids end up with some kind of animal or monster taking care of them as they grow up. Some kids' lusi end up staying around when they grow up, if they live that long." None of her friends' lusi were still alive, but Terezi was pretty sure it did happen sometimes, when the world wasn't ending.