I have two characters. They're both on different data centres entirely. I get to play on JP with my real life friends and fellow Australians, while I play on NA with my American friends.

I main Bard on my main and main Black Mage on my alt.
My main is a Miqo'te and my alt is an Au Ra. Yes, I chase tails all day.

The different servers have different peak times, therefore sometimes I log off my NA character (whose peak period is during my day) to jump on my JP character at night.

I play more on my alt at the moment since my classes are all 60 on my main and I'm leveling on my alt.

Getting Battle High/Fever in Frontlines are MUCH easier on NA than JP, so I casually have fun there. (Though I haven't played in ages since I heard about all the bots)