I love River and Jack both, although I don't play any DW characters, myself.
Still, I've got:
Tony Stark from the MCU. He's here to fix stuff and build stuff and help if anyone needs it. He's often seen on his own porch tinkering with this and that. And probably also at Carol's bar, these days.
Clint Barton/Hawkeye from the comics: He's friendly! And also co-owns the local coffee shop (aptly called COFFEE.) so he can be found there most mornings, slinging coffee and possibly even lattes if he's been out scavenging in the doors lately enough to come back with fresh supplies.
Loki from the comics! Loki is a little sassy and mostly just likes confusing however he best can. He's less interested in world domination and more about leaving this place. But he's flirty and not completely unfriendly.
Sirius Black: From Harry Potter, in the marauders era. He's young, spry, excitable and happy to do some magic for folks so long as it doesn't cut into his own plans.