Being bilingual gives you panache, especially in the U.S. where most native-borns are monolingual. Many people have said to me, for example, ' I never met an American before who spoke French fluently. Being intelligent helps, but magnetism is more a question of personality than intellect. A person of average intelligence can learn to do many magnetic things, such as use eye contact, have a good handshake, compliments others, etc. A quiet, shy person can begin to take little steps by expressing a few basic feelings and then working toward more expressiveness.
Passion is a key emotion for magnetism, charisma, and leadership.
People are charmed by those who are passionate about their cause. Being passionate is a contributor to magnetism. Be passionate, but not out of control and annoying like an evangelist. Even if you hate smiles, get a smile coach. Smiling can be learned.