Hiya and Heya are very similar twins in appearance and friendliness except one you can sit next to in silence scrolling through something on your phone or getting lost in your thoughts, just enjoying each other's company, and the other has hugged you from behind, is planning to ramble endlessly at you, and while they are not currently bouncing off the walls, they are definitely not apposed to the idea.
Ps: I love both of them so much