- Physiological (breathing, food/drink, environmental comfort, sex)
- Safety (body, family, health, morality, property, resources)
- Belonging/Love (family, friendship, intimacy)
- Esteem (achievement, confidence, respect, self-esteem)
- Self-Actualisation (acceptance, creativity, morality, problem solving, spontaneity)
- Character Motive - These needs feature significantly in human behaviour and can be applied to your character (writing from an alien or non-humanist perspective can skew these priorities) and why they do what they do. It takes some significant threats for enemies to work together; any/all of the physiological needs will do so.
- Plot Hooks - Attracting the interest of your audience (who are usually human) means giving them something they can relate to. These hooks can prioritise perspective and even colour participation. The safety of family can cause someone to turn against a lover, especially if they're the ones threatening them.
(Inspired by this blog post.)