What if Yamcha and Bulma had stayed together?
Above is a pic of what Trunks would look like if it was Yamcha's son.
What if Tien and Lunch/Launch would have stayed together?
What if Maron and Turtle hooked up?  He did save her life once.  And she called him cute.
If you think that's scary, how about...
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They had a good time in Korin's Tower. 

That would be one smart and brave kid ; )
Couples Pics