So the negative traits from Realism Invictus are ...
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Anti-Clerical = +1

from Religious buildings.
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Cruel = 20% more XP needed for Unit Promotions
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Arrogant = -20%

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Idealistic = 25% Slower Production of Military buildings.
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Revolutionary = -2 to Diplomatic Relations
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Megalomaniac = 20% Slower Wonder Production
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Barbaric = -25%

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Isolationist = -25% Foreign Trade Routes, 25% Slower Production of Trade buildings
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Fanatical = -25%

Birth Rate
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Populist = +25% Civic Upkeep
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Executive = -10%

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Foreign = -25% Worker Speed, -25% Production of Workers
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Temperamental = -50% Great General Emergence Inside Cultural Borders
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Schemer = -40% Great General Emergence
These all seem like good 3rd traits to have to help balance the leaders.