How the the playwright describe Higgins at the opening of act 2

These are the exact words to describe Higgins:

He is, in fact, but for his years and size, rather like a very impetuous baby "taking notice" eagerly and loudly, and requiring almost as much watching to keep him out of unintended mischief. His manner varies from genial bullying when he is in a good humor to stormy petulance when anything goes wrong; but he is so entirely frank and void of malice that he remains likeable even in his least reasonable moments.]

So, Shaw is telling us that he is easily excitable, wants to do many things at once, is easily distracted, and gets really mad if something doesn't go the way he wants it to go. However, he is also quite honest, and people seem to generally like him.