im working on an organic / traditionally drawn comic right now, and i really like combining ink with charcoal - they contrast nicely bc ink can be very neat and specific in its marks and goes full black, whereas charcoal is far softer and vaguer, but great for texture and movement. i like working in black and white with a first layer of black ink lines and block shading, plus a second layer of tonal charcoal or graphite shading.
re: graphite, i suggest looking for some conte crayons / compressed charcoal! sturdier than charcoal sticks and creates great dark fields of shading.
ive also been recommended speedball pens for comics, although i havent bought one yet, so :shrug: