Yukari is perhaps the hardest of all characters to properly analyze, because she's the least like a real person. While most everything she does is fairly natural, a person with all of those flaws and willingness to give in to them at any point in the day is very absurd. Especially since she hasn't lost her job or been involved in a bar fight. Maybe Nyamo is serving a good purpose in taking all of Yukari's aggression: she's insuring that Yukari doesn't hurt other people.
At the same time, Nyamo is a huge enabler. Yukari is entirely dependent on her. She requires Nyamo's companionship, immediately assumes she can sleep at Nyamo's house when construction workers are working near her own, constantly needs to shove her superior knowledge of english in Nyamo's face, and needs rides to different places. If Nyamo would just put her foot down and choose other people to hang out with, Yukari's current life would fall apart -- and she'd try to make Nyamo's fall apart too.
It's kind of amazing how much Nyamo lets her get away with it. The story sort of implies that Nyamo sees the two of them as basically equals, as Nyamo, who despite criticizing Yukari's behavior, never calls Yukari a bad or immature person. And in the spring episode, Nyamo calls them both childish, when she could have very easily only called Yukari childish. The audience would have no reason to disbelieve her. By including herself, Nyamo is making a statement about how she perceives her own flaws, flaws which by and large the audience doesn't get to see. Nyamo, however, does see her own flaws, and thus is apparently incapable of viewing her own life as more advantageous than Yukari's.
At the same time, Nyamo is a huge enabler. Yukari is entirely dependent on her. She requires Nyamo's companionship, immediately assumes she can sleep at Nyamo's house when construction workers are working near her own, constantly needs to shove her superior knowledge of english in Nyamo's face, and needs rides to different places. If Nyamo would just put her foot down and choose other people to hang out with, Yukari's current life would fall apart -- and she'd try to make Nyamo's fall apart too.
It's kind of amazing how much Nyamo lets her get away with it. The story sort of implies that Nyamo sees the two of them as basically equals, as Nyamo, who despite criticizing Yukari's behavior, never calls Yukari a bad or immature person. And in the spring episode, Nyamo calls them both childish, when she could have very easily only called Yukari childish. The audience would have no reason to disbelieve her. By including herself, Nyamo is making a statement about how she perceives her own flaws, flaws which by and large the audience doesn't get to see. Nyamo, however, does see her own flaws, and thus is apparently incapable of viewing her own life as more advantageous than Yukari's.