His spirit , with help from Hei Bai , guided Aang to Roku 's Island and helped Aang achieve a connection with Roku .
Fang was Avatar Roku 's dragon - animal guide .
His spirit , with help from Hei Bai , guided Aang to Avatar Roku 's Island and helped Aang achieve a connection with Roku .
Fang was Avatar Roku 's dragon - animal guide .