Rory/Rozalia (twins)
On Earth: I would probably continue life as normal, just take a whole lot of more selfies, start calling myself Rory, and become a hot male cosplayer that can also wear female cosplays and make it work. For Rozalia, I would just be a hot pale lady who may or may not be a Vampire.
In Regalia: If I woke up in Aloria, I wouldn't actually be in Regalia, seeing as Rory doesn't sleep there. I'd be in Fendarfell and I'd have to take the long trek all the way to Regalia. x0x So after I went there, I'd go around and start trying to act as normal as I could. Same with Rozalia, except I'd wake up in Ithania instead.
Francoeur
On Earth: I would do my best not to freak out my mom and sister by being a giant flea(or "vespid" because we can't be fleas).. And then I would go on to be extremely adorable with a lot of chirping and chitter noises.
In Regalia: Same thing I always do when I'm him. Crawl out of my hiding place in the sewers and just stare at people, unable to actually talk and tell people what I am. Francoeur sucks at speaking..
Dani
On Earth: I would have to try and live out through that day with the urge to kill my family and eat them for dinner. And NOT be confused as to what my biological gender would be(as Dani). But since we all know, Dani is agender, and to top it off, androgynous, so I might confuse my family as well.
In Regalia: I'd still be trying to act natural, but since people don't really know Dani that well, I'd be trying to hold back my urges like Dani does, but they're a lot better at it than I am. Trying not to kill pretty shirtless men. Bluh.