She enjoyed fixing broken drones and giving them names and human hair, something other humans disapproved of. Actually it's AbsoluteSolver hiding in Tessa's dead body but "she" will try to hide it in every way.Tessa seems to be a very lively individual. This is demonstrated in "Home" where Tessa screams "N" in excitement and spins him around very energetically. Given that the AbsoluteSolver masqueraded as Tessa with full intent to pass as her, it seems like this was one of her actual personality