Character: Jonathan Wilde
How would they handle discovering something upsetting/disturbing?: Some cursing. A second to process. Then off to the relevant authorities. Wilde isn't in a good place right now. He doesn't feel right about almost anything, but most of it is his own lingering relationship angst. An event like this would bring him back to earth a bit and remind him that there are more pressing things to worry about right now, directly in front of and around him.
Would you like to choose one other character to accompany them?: An ESB!!
Anything else?: "solidly in the horror genre" is my middle name