Timon can be rather selfish and thoughtless at times, but in the end, he has a good heart and is loyal to his friends. Unlike most meerkats, who work constantly, Timon is a lazy daydreamer which results in him being cast out of his colony. His status at the bottom of the food chain means he relies on stronger animals to protect him once he's on his own, and as such he usually looks out for himself, but nonetheless he never abandons his friends in times of trouble and is willing to risk himself for them. He is not as clever as he'd like to think he is, often claiming Pumbaa's good ideas as his own (and seemingly genuinely believing it). He's not incapable of thinking up his own plans though, his greatest moment being the 'Tunnels' plan in The Lion King 1 1/2.
the adventures started when he and Pumbaa ended up in India somehow after falling from a water fall. it's never truly explain how they ended up in india from africa so quickly, but details are not impourent right now. after several scrapes from various villains, Timon, Pumbaa, along with Simba and Nala are leaders of the Jungle crew, although Simba and Nala are actselly more serious leaders.