Ghost Rider and default bike here: https://www.deviantart.com/xelandis/art/Ghost-Rider-Marvel-Heroes-XNALara-686604816 Lost soul bike here: https://www.deviantart.com/lezisell/art/Ride-to-Hell-Retribution-Bike-pack-1-XNA-XPS-432196594

The original Ghost Rider model had a free floating skull head and no neck so I replaced that with a flaming skull and added some skeletal bits to fill the void. It wasn't easy to pose him on the cycles and this may result in odd looking bits.

Why settle for my stl models or wait for someone else to get around to your favorite character? You can pose these models yourself with free software Blender with xps tool. Maneuver a model into a game piece pose and then you can export it as stl. Share on thingiverse. I'm convinced you can do it. Please help out, there are so many characters available at deviantart.

The necessary Blender DL info is here: https://www.deviantart.com/johnzero7/art/XPS-to-Blender-2-7x-Blender-internal-the-easy-way-489500171