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I have this beautiful plant in a jar on my bookshelf, but I’m not quite sure just what she is. Would anyone mind helping me figure it out?
@rynras
Yeah, I agree with the others here. The patterning on the leaves looks like pothos (epipremnum aureum) aka “Devil’s Ivy”. A very easy plant to care for, tolerant to low light and occasional lack of water, which loves to grow into long trailing vines. Consider finding it a home in a hanging basket or on top of a bookshelf when it gets bigger. 
@InvaderXan Would I be able to keep it in the water (maybe putting it in a bigger container), or should I transfer it to soil?
@rynras
I’m pretty sure they’ll grow happily in either. If I remember right, they even grow different kinds of roots in water and soil. So it’s entirely up to you. 
Just remember to occasionally give it a few drops of nitrogen rich fertiliser either way.
@InvaderXan Thank you! You’re a gem 