This might sound dumb, but the Five-Headed Dragon, can it be summoned with Future Fusion?

Yes. Every fusion monster can be summoned with Future Fusion.

Except those fusion monsters with fusion monsters as fusion material, e.g. Elemental Hero Shining Flare Wingman.

Or a special summoning method, like XYZ-Dragon Cannon or Elemental Hero Dark Neos.

Right. I shouldn't of said ALL fusion monsters.

I thought as much, I feel silly for asking, but I had to be sure.
(It didn't give card names so I wanted to double check)
After posting I re-read Chimeratech and noticed it's the same case scenario.
But thanks none the less

As long as...

A.) There is no effect that would prevent you from doing so

B.) No Fusion Monsters involved in the Fusion Material Monsters

C.) No Fusion Substitutes (unless they make one with a Substitute as an actual Material Monster needed)...then you can use Future Fusion on it...

D.) Fusion Monster does not have a specific method of summoning except Fusion Summon (VWXYZ Fusions and Neos Fusions falling under this category)

Just needed to be certain, so thanks