What are two quotes that show Gatsby personality/ how he acts (example how is he mysterious)

From the text:

The two girls and Jordan leaned together confidentially.

"Somebody told me they thought he killed a man once."

A thrill passed over all of us. The three Mr. Mumbles bent forward and listened eagerly.

"I don't think it's so much that," argued Lucille skeptically; "it's more that he was a German spy during the war."

One of the men nodded in confirmation.

"I heard that from a man who knew all about him, grew up with him in Germany," he assured us positively.

"Oh, no," said the first girl, "it couldn't be that, because he was in the American army during the war." As our credulity switched back to her she leaned forward with enthusiasm. "You look at him sometimes when he thinks nobody's looking at him. I'll bet he killed a man." ch 3