[@Loony]

The Strength and Weakness isn't so much about an emotion but feeling. Think of it this way, where do there powers come from. For my character, Compassion/Protection is how she draws her weapon or how she keeps her fusions strong.
Her weakness is that when angry, it makes it less likely to have things go smoothly. Just as if in a fusion, if her teammate tries to fuse when angry or thinking violently the fusion is more likely to fall apart or be more unstable.