Ok, since I'm in the middle of a thunderstorm (luckily inside with rain lashing the windows and lightning forking horizontally, thunder shaking the house) here's an idea: A lightning elemental that comforts their partner who's terrified of storms. Eventually they come to feel invigorated by the energy of the storm instead of frightened, enjoying the light show while being wrapped in the slightly tingly embrace of their partner. Thunderstorms always make the elemental more... active, shall we say? And at other times, once the human is accustomed to it, the elemental lets little mini forks of lightning dance between their fingers to make their human smile sometimes. Bonus points if they make little tesla coil sounds too...