So if the attacking player decides not to attack with the non-Fantastic Four character, the energy is refunded. ?
No, because Rule 3.1.10 (2) was not violated. The Sidekick could still attack and an opponent’s Character die could have been forced to block that Sidekick. The Attack Step not being initiated in this scenario does not preclude there not being legal targets available.
What if instead the non-Fantastic Four character was somehow removed?
At the time the energy for the global was spent, if the Sidekick was active there is no violation of Rule 3.1.10 (2) because a legal game state exists – the Sidekick could potentially be forcefully blocked (if that Sidekick attacked).
Also, what if the blocking player chooses to pay the cost and Block the Fantastic Four character? Is the energy still refunded?
In this case, the opposing player is not being forced to pay a cost, so there is no violation of Rule 3.1.21, and the spent energy is not refunded. Here the opponent may want to pay the cost so they can trigger some other ability or create a desired game state (e.g. having their blocker KO’d). You would not know of your opponent’s intent to instead pay the cost until after you initiated the Attack Step. If your opponent decides not to pay the cost to block, provided you had a non-Fantastic Four Character die active when you paid for the global, the energy was still spent under a legal game state and would not be refunded. In any case, your opponent cannot be forced to pay the cost.
Again, this discussion focuses on playing ethically. The suggestion for
ethical play is to refund the energy if the Active player forces a block and knowingly intends to attack with only Molecule Man instead of with the Sidekick either by itself or with Molecule Man – or just not spending the energy at all if the Active player’s intent is not to attack with the Sidekick.
From the rules perspective, as long as a non-Fantastic Four (FF4) affiliated Character die is Active when the force-to-block global is used a legal game state exists and the energy can be spent. Therefore, regardless of whether the Active player decides to not attack, attack only with a FF4 Character die, or no longer has a non-FF4 Character die Active after the global was used, does
not preclude the paying for the global or the refunding of the energy.