A good bedroom chair is the one you actually sit in, not the one that just holds yesterday's sweater and a half read book. You want something with enough give in the seat that you can drop into it at the end of the day, and arms if you're the type to read before sleep, because nothing kills a chapter faster than your elbow hunting for support that isn't there. The best ones feel a little forgiving, a little soft at the edges, nothing that makes you sit up straight when all you want to do is slump.
Color is where people overthink it. I spent a long time convinced a bedroom chair had to match the duvet exactly, like matching socks, and ended up with a mustard velvet thing that fought the quilt every single morning. Now I'd push you toward something quieter, a soft neutral, a muted blue, a boucle in oatmeal or stone, colors that sit next to whatever you already own instead of competing with it. Pattern is fine if the rest of the room is calm, but a boldly patterned chair next to a boldly patterned bed is a lot to wake up to.
If you own zero bedroom chairs right now, start small and start soft. A slipper chair without arms, something in the range of twenty four to twenty eight inches wide, is forgiving in almost any corner and doesn't demand its own conversation with the rest of the furniture. It reads as a seat, not a centerpiece, which is exactly what you want when you're not sure yet how much you'll actually use it.
Where it earns its place depends on the room. In a bedroom with a real reading habit, put it by the window, with a lamp and enough floor space, at least two feet in front of it, so it doesn't feel like you're sitting in a hallway. In a smaller room, skip the ottoman and skip the side table that matches, one extra surface in a tight space just becomes a place for laundry to live. Bigger bedrooms can take a pair, flanking a window, which looks lovely in photos and is also just a very comfortable way to put your socks on in the morning.
Winter rooms want something with more texture, a knit throw draped over the arm, a chair that looks warm even before you sit in it. Summer bedrooms do better with lighter fabric and a lighter frame, something that doesn't visually weigh the room down when the windows are open and everything else feels loose.
I'd look for the one that makes you want to sit down the second you walk past it.