I don't think there is an iconic male non legacy hero to name from recent memory.
Monkey Prince seems like the best bet.
I don't mind if Shifter and Downpour got canonized as future versions of the Wonder Twins. I agree about Wind Dragon and Longshadow tho.
Even if it's just friends hanging out, I'd be fine with it. Outside of Deilan and Dragonson, the other 3 are hanging out with the hero families. So I'm hoping the other two follow suit.