I'm trying to find some webcomics that I've half-forgotten. It had alternate universes, and a mailman, and I think the mailman's alternate self was important to the plot. Another (or maybe the same?) had timetravel and a scientist whose experiments always exploded and his room-mate's girlfriend was Satan. Does anybody recognize these?
The second one is
Casey and Andy by Casey Grimm and Andy Weir, the latter of Martian fame; basically the "two gamers on a couch" style of comics common back then, only it was mad scientists rather than gamers and the King of Sweden hijacked the couch. I'm afraid I do not recognize the first off the top of my head.
EDIT:
Oh, speaking of, Andy Weir rebooted
Cheshire Crossing, this time with Sarah Andersen of
Sarah's Scribbles on the actual art. Basically, it's what if Dorothy Gale really went to Oz, Alice Liddell really went through the looking glass, and Wendy Darling really went to Neverland. Have the father of all nuclear physics bring them together with
[redacted] as his aide, and this comic is what ensues.
EDIT 2: Actually, it doesn't look like his assistant's identity was revealed immediately in the reboot, so I'll trim that as a spoiler. There are enough clues just from her speech patterns that a few folks have already guessed, though.