Hello,
I've got a routed /64 on one of my tunnels and when i do a traceroute6 on one of them ip addresses i see my username.
Is there a way to have my rdns show instead of the one with my username?
Nope, that is the rDNS entry on your tunnel's point-to-point /64. It will always be a hop before your routed space.
What might work is to remove your tunnel endpoint address and add an address from your routed /64 to the tunnel, and then add the same address to your LAN interface.