He went for a quite a while with no SG. I had been vaguely familiar with the Apostles/Heretics of RO cross-server multi-group, and eventually Sun Son sought them out and joined their hero branch. It turned out he never teamed with them very much, and so several years later he joined a friend's small SG.
I chose the Willpower/Fire combo because they would make a good tank soloist. Willpower was one of the most popular protective sets (for good reason), and Fire had the reputation of offering the most damage output. The look is sort of basic, but I do like the Sun symbol on his chest. Too bad I never wrote a description revealing the scientific basis of his powers, nor offering a hint as to his name. Why "Son"?
With his not-exactly heroic battle cry, he may have eventually aligned himself as a vigilante.