The bright glow will happen whenever Marcos' power is activated. As his power is more on the passive end of the scale, this will likely be more situational, such as when he's having a conversation with someone, or perhaps, as you've suggested, more specifically when he's asking questions. The details of this we're happy to leave to you, though we do want to be clear that his power should not be considered constantly active.
And yes, characters are free (and encouraged) to cover up the glow, though it may take a couple of layers!
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The bright glow will happen whenever Marcos' power is activated. As his power is more on the passive end of the scale, this will likely be more situational, such as when he's having a conversation with someone, or perhaps, as you've suggested, more specifically when he's asking questions. The details of this we're happy to leave to you, though we do want to be clear that his power should not be considered constantly active.
And yes, characters are free (and encouraged) to cover up the glow, though it may take a couple of layers!