If the power of a Character blocking this Character becomes 6000 or more due to a Counter, does the target of the attack revert back to the original target?

No. Since the [Blocker] has already been activated, the target of the attack will remain the Character that activated the [Blocker].

[ST01-002_p2] - Usopp (Super Pre-Release Starter Deck 1: Straw Hat Crew) - One Piece Card Game

[DON!! x2] [When Attacking] Your opponent cannot activate a [Blocker] Character that has 5000 or more power during this battle.

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