Hmm, to be serious, if the domineering person you are talking about is a big man, how about Liehu? If it's a young man, then Longquan.
As for the immortal spirit. . . You can call yourself Taiping Taoist, Guigu Sanren, etc., if you still want to be normal. . The old man can call him Chen Deyi (male), and the younger man can call him Long Quan. I always feel that this name is versatile. . .