独树一帜

1. • lit. to fly one's banner on a solitary tree (idiom) fig. to act as a loner
2. • to stand out
3. • to develop one's own school
4. • to have attitude of one's own

Character by character

• 独(dú)alone
• 树(shù)tree
• 一(yī)one
• 帜(zhì)flag