Dic: character as an uncountable noun meaning 'strong personal qualities'

• She showed real character in her attempts to win over the crowd.
• I didn't know Ron had that much strength of character. 
• Everyone admires her strength of character and determination.
• He showed great character returning to the sport after his accident.
• Adventure camps are considered to be character-building .

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[N-Uncount] If you say that someone has character, you mean that they have the ability to deal effectively with difficult, unpleasant, or dangerous situations.

[Uncountable] (approving) strong personal qualities such as ability to deal with difficult or dangerous situations

CF.

• An ugly shopping centre stands across from one of the few buildings with character. 
• The modern hotels here have no real character.
• a face with a lot of character

[N-UNCOUNT] If you say that a place has character, you mean that it has an interesting or unusual quality which makes you notice it and like it.

[uncountable] (usually approving) the interesting or unusual quality that a place or a person has

CF.

• He'll be sadly missed. He was a real character.
• She's a real character!

[N-COUNT] If you say that someone is a character, you mean that they are interesting, unusual, or amusing. (INFORMAL)

[countable] (informal) an interesting or unusual person

........ COBUILD, OALD