Charcoal and pastels(soft and pencil). Not my usual mediums, but I find they can be very forgiving, and useful for quick, spontaneous work that doesn't necessarily need to look 'finished' or polished.
Basically anything that's fun to use. My fave materials are watercolors, tempera, acrylics, and chalk. I also really like using modeling clay when I get the chance.
Just normal pencil is most in my comfort zone. But I am also pretty comfortable with colored pencils. Beyond that, I tend to make tons of mistakes and not know how to correct them in the future. XD
Sketching on lined paper with a Ticonderoga pencil. I've finally gotten to the point where I'm just as comfortable drawing in a sketchbook as a composition book, but I still end up doing it all the time anyways. Too much practice doodling in class, I guess.
Pen, paper and pencils. I've been doing it the longest, and I really get the most satisfaction out of seeing the finished product. It's especially fun when I combine it with other mediums, like watercolors (another comfort medium of mine <3)