Here's a new way to visualize the five aggression levels: the thunderstorm analogy!
Picture yourself like a beautiful day. The sun is shining, and all seems calm. This represents the first level, passive. Not much really happening (Examples: Flora, Tecna, Natalie).
Next, clouds start forming, but the sky remains blue. This is the assertive aggression level.
But then, the clouds turn gray, and a low rumble of thunder is heard from a distance. This is the third level, mildly passive-aggressive (Electra post-Season 6, episode 26, Bloom, Sierra, Flora in Season 6, episode 18, and Aisha).
Suddenly, it starts to rain. This is the passive-aggressive, angry state (Stella, Musa, Lori, and Electra during Season 6, episodes 16-24 and the entirety of Season 2).
Lightning starts shooting randomly. This is the aggressive level.
Practice acting out this analogy, role playing as each of the five scenarios.