Not sure if this thread is dead yet but...
(This is all based on what's been said)
I think you should create a NW when you get your rogue high enough (lvl 20). That way, whatever equips and stars you come across on your rogue, you can alternate and give to your Night Walker (you'd have to transfer items quite often though). This way, if you get bored of one, there's always the other to play on.