So many things make people likable. I find most people at least superficially likable. A person is especially likable to me if they can: talk about a diversity of topics with a moderate degree of competence, are somewhat self-disclosing and open, true to themselves, trust other people and are trustworthy, easily enjoy the company of other people, are optimistic or at least actively working towards a brighter day, generous, polite, humorous, flexible, able to see issues from multiple different angles, accepting of others and their weaknesses, and playful.