Though the focus of "The Monkey's Paw" is much more on plot than on character, there are some nice moments in the story that give us glimpses of each character's personality, particular the character of Herbert.

Herbert is portrayed as fun to be with..... he's portrayed as a caring tease. 

"Likely," said Herbert, with pretended horror. "Why, we're going to be rich, and famous, and happy. Wish to be an emperor, father, to begin with; then you can't be henpecked."

"I expect you'll find the cash tied up in a big bag in the middle of your bed," said Herbert, as he bade them good-night, "and something horrible squatting up on top of the wardrobe watching you as you pocket your ill-gotten gains."

"Well, don't break into the money before I come back," said Herbert, as he rose from the table. "I'm afraid it'll turn you into a mean, avaricious man, and we shall have to disown you."

Seeing Herbert in the way allows the reader to grieve along with his parents. What a price to pay for two-hundred pounds.