A mad scientist, a cyborg, a visionary, a man of god
A tall lanky man with a distracted air, well versed in arcanotechnology, parapsychology, and a collector of molds, spores, and fungus.
30 job types/classes for PCs in the Cosmic Era
An attractive older woman with more degrees than a thermometer
When was the last time a character caught a cold or flu? Real people get them every now and again even with solid heating and dry interiors. Your characters are out in the cold and wet, and even inside is not always dry and warm. Imagine having to stop your dungeon crawl, sitting in a tight defensive position, while you all are feverish.