But if she's part of a mafia faction, then she still has living partners, so her death brings us nothing in the immediate future. If Hobo is a Serial Killer, then we've immediately eliminated a night kill, which is presumably beneficial, unless you're hoping he kills another mafia.
As for why I suspect him more than the others you named... Hansen is Danish for "son of Hans". Derek is an anglicised form of a German name. It is far more foreign than our two confirmed innocents: George Brown and John Baker.
And yes, I have been looking at the list for false names, and 'Lavender Biggs' is one that jumped out at me. If I had to guess, you and Fox and Ravens are the most likely to be town, Hobo and Yuna are almost certainly not, and the other three are in between, possibly real but they could also be scum who caught on to the game.
~Master Splinter
Victorious in Bergioyn's legendary 'Reverse Mafia'. *MySmiley*