Popular, Popularity
noun, な adjective, の adjective
If a person has a lot of energy then they're very charismatic and fun! What's another feature of charismatic / fun people? They are most likely popular as well.
にんき
This is a jukugo word, which usually means on'yomi readings from the kanji. Since 人 and 気 both have two on'yomi readings, here's a mnemonic to help you: You're so popular that you've been given the Nintendo key (にんき). That's right, Nintendo gave you the master key to their entire office. Just like that. This is a lot of responsibility even for your levels of popularity, so be careful not to lose this key!
今、人気の本はこれです。
This is a popular book now.
このビールは、とても人気があります。
This beer is very popular.
あのドラマのおかげで、イタリアンレストランの人気が上がった。
Thanks to that drama, the popularity of Italian restaurants has increased.