To me my character IS a mix of a lot of things, and I don't really know how much, if any, is getting carried over.
Its not just my looks, which frankly I don't care that much about. Its the 5k grimoire score that I have achieved over years, and all those stats like 85000 kills with a handcannon or 844 deaths to Crota. Its that stupid fucking little Tiny Box of Raisins I've had in my inventory for years, doesn't do a damn thing, but hell if I will delete it. Its the Rank 86 I have with the crypto-arch Rahool, which took a lot of goddamn engrams to achieve. Its the 8 items I have sitting in my postmaster because my inventory is full and I am too lazy to delete anything but it feels good when I go to the postmaster and see this cache of items just waiting to be picked up someday, like 10 year old christmas gifts.
THAT trivial shit is my character, and all that will probably be gone when I play Destiny 2. Its not end of the world, but its kinda lame.