Boris doesn't have any wings... Dave and Boris explore how to focus on and employ personal strengths as form of overcoming perceived self-weakness and a depression that might ensue from a hyper focus on individual failings. Boris learns to love his strengths even while coming to terms with the fact that he cannot fly.
This is RHE:
RR4 : Respectful Relationships - the importance of self respect and how it links to happiness.
MW2 : Mental Wellbeing - that there are a range of emotions that all humans experience.