You should really implement the rename characters option directly in the game if possible.

From the different topics i see about it this is definitely something some peoples really want, i personally really want this option.

That sound like a minor option, i know but when you invest hundreds of hours into a characters i think the name you choose is important and even  if you choose a name you like 6 months ago a lot of things can make you wanting to change this name 6 months later or even 3 days after.

I mean this is awesome we can ask for you to do it  but if you add the option directly we don't have to always bother you and we can do it at our own leisure, this is win-win solution for me.