One who makes a show of liking another person with profuse or excessive displays of camaraderie, such as vigorous hand clasping, back-slapping, hearty words of greeting, etc.
One who uses obsequious compliments to gain self-serving favour or advantage from another; a servile flatterer.
One who seeks to gain through the powerful and influential.
To play the sycophant toward; to flatter obsequiously.