Aha! Thought you’d never ask.
Firstly, archetypal compatibility is not reciprocal — just because one is compatible with the other doesn’t mean it would also be the other way around as well. BUT for the Protector and Mother, it turns out that they’re really great for each other!
The Protector is compatible with the Mother (See Isis)
Because both represent a strong desire to keep loved ones safe and secure. These two archetypes embody the instinct to protect and shield those who are vulnerable, except that the Protector archetype perhaps does it so sometimes conditionally.
More on compatibility …
Archetype compatibility refers to the idea that people are drawn to certain personality types or archetypes that complement their own. These archetypes are thought to be universal patterns or symbols that exist across cultures and time, and are rooted in the collective unconscious.
When it comes to romantic relationships, for example, some people may find that they are consistently drawn to partners who embody certain archetypes, such as the Caregiver (oh so popular and high-demand archetype for most!), the Rebel, the Adventurer, or the Scholar. This attraction is often based on a deep sense of resonance or familiarity with the qualities and traits that these archetypes represent.