How many characters can I have and do they expire?
Solution 1:
You can have 10 characters per server. In addition, they can be any mix of hardcore and non-hardcore characters. I'm assuming 10 was chosen so that you can theoretically have 5 non-hardcore characters and 5 hardcore characters.
Also, characters won't expire.
Solution 2:
Regarding character deletion/expiration:
Characters will not expire.
Source: Community Manager Kaivax