Deathwing
<Bronze Donator>
Seasonal only items are not a thing anymore.Yes, make a season character. Some items are season only, and then in 2-3 months when the season ends your characters become non seasonal and can be played still. Only difference is start of a season all chars are reset to 1.
Make all the characters if you want, doesn't matter which you want to start with. Barb/monk/crusader take 30% less damage by default than wd/wiz/dh so depending on your skill level + difficulty, you can tailor it around to whatever you want.