effervescent (nishinoya yū)

effervescent/ˌefərˈves(ə)nt/
-(adj.)
1. (of a liquid) giving off bubbles; fizzly.
2. vivacious and enthusiastic.

"on one level, life is effervescent and active. on another, it is absolutely still. the inner stillness nourishes the outer activity." -jaggi vasudev (sadhguru)
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in which a libero from aoba johsai moves to karasuno and finds a boy that shines like the sun.
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NOTE!
although this is primarily a nishinoya x reader, i will also be including headcanons and potentially one-shots that are not connected to the story whatsoever, so if you're not a big fan of this literal ball of sunshine (which i cannot even begin to comprehend HOW) then you'll have other things to look forward to as well!