IPA: /ˈtʃɑːrmər/
KK: /ˈtʃɑːrmər/
A person who is very attractive or pleasant in a way that makes others like them easily.
He is such a charmer that everyone wants to be his friend.
Charmer → It is formed from "charm" (from Old French *charme*, meaning a magical spell or incantation) and "-er" (meaning a person who). A charmer is a person who casts a spell or has a captivating influence over others.
Think of someone who uses a 'magical spell' ('charm') to attract or influence others — that's what a charmer does.