Jiki
When with people who are unfamiliar or are ordinary, he appears soft-spoken and good-natured. However, when with people who are familiar or strange, he would accidentally make snide remarks. Rather, his making these comments seem more truthful then accidental.
He collects many different medicinal plants because he enjoys cultivating them. He may seem cold, but can be quite sociable. Though, that too may have been just a facade.