Cygnus preparation question ;o

If I decide to choose a class, let's say warrior, and change my mind and wish to make a Nightwalker instead, does that mean my new cygnus (meaning that I delete the original) won't get the benefits from my main?

I'm not actually quite sure if you can even delete Cygnus characters. But you can make more than one if you have enough slots. Since the patch will give you an extra slot, if you already have another lv 20 adventurer, (or wait a month for the newer system) you can make another Cygnus. But if you happen to be able to delete Cygnus characters, then yes, your new Nightwalker will get bonuses from its parent character, as long as you made it through your main.

I'll need a bit of correction myself, really, but those are two of your options.