What MC attributes does the IC Unique Ability undermine?
Does the Influence Character's Unique Ability undermine the Main Character’s personal problem or their Unique Ability?
The IC Unique Ability undermines the MC Unique Ability. The IC's Unique Ability acts to counter the effectiveness of the MC's Unique Ability, which is the quality that makes the MC uniquely suited to helping the Story Goal be achieved in the Overall Story throughline.