"Rupling" is most commonly used when referring to someone whom's mannerisms are extremely like-able. Similar to a pet name 'Rupling' is a term/nickname used among friends. Even in public if someone's vibe is very positive they may be referred to as a Rupling of the party
" Margot is definitely the Rupling of our friendgroup wouldn't you agree?"
"hes such a cool rupling i wish i was like him"