Huntik Comp Rules:407.1 Some modifiers stun a hero or obstacle in play. A stunned card is exhausted and turned face down. It remains in its current zone, but it can’t block, ready, move, or enter any other zone. A stunned card has no text or tags, but it keeps its name, controller, owner, and any counters that are on it. Either player may look at a face-down stunned card at any time.
Based off that rule, I would have to say a stunned hero would still be considered either friendly or an enemy.
Simon Key
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