How does Tom convince Huck to stay with the Window Douglas, and how does his doing so reflect one of his strongest character traits?

Tom told Huck that he couldn't be a member of his band of robbers if he wasn't respectable.

"Now, Tom, hain't you always ben friendly to me? You wouldn't shet me out, would you, Tom? You wouldn't do that, now, would you, Tom?"

"Huck, I wouldn't want to, and I don't want to—but what would people say? Why, they'd say, 'Mph! Tom Sawyer's Gang! pretty low characters in it!' They'd mean you, Huck. You wouldn't like that, and I wouldn't."

Huck was silent for some time, engaged in a mental struggle. Finally he said:

"Well, I'll go back to the widder for a month and tackle it and see if I can come to stand it, if you'll let me b'long to the gang, Tom."

"All right, Huck, it's a whiz! Come along, old chap, and I'll ask the widow to let up on you a little, Huck."