Doctor or medic type it is. 

Now, from what I understand from the description. We are looking for a new homeworld. And it seems prudent that any doctor type would be well versed in lots of science. Ex: toxicology, xeno-biology, biochemistry, etc...

My first thought for the character is an older biochemist who has been working (and failing) to fix the crops problem and treats villagers with basic medical care, such as drug treatments and low level emergency medicine.


This sound like a good base line for the character.