652Graystripe
Plantera
I'm against bosses in general, but this one really does not fit with Terraria. I really can't see any random watermelon showing up in Terraria; the only real fruit-based storyline here is about pumpkins. And you must be more creative than me if you can think of a good watermelon storyline.That would play.
Anyways my opinion on the idea is it was thought up in a few minutes like "hey what if...", and the idea doesn't fit in with Terraria at all. It doesn't attach to any pre-existing object or theme in Terraria.
No support.