Donnie is only a teenager who’s learning everything on the fly and is frequently answering questions from his brothers with sarcastic and outlandish responses before yelling that he doesn't know. He is much more high-strung and quick to anger than most would think. He frequently gets frustrated when he can't accomplish a task. He can be defensive and argumentative, especially when his intellect is challenged. Ultimately he’s sweet and thoughtful and will do the right thing by the end of the day.