1st house - the most visible house, the first impression of a person, shows appearance, behavior, style, instinctive reaction to the surrounding world. And Jupiter is very noticeable here. Jupiter in the image of a person is usually associated with a representative, prominent and solid uncle, with a beard, with large facial features, with a large nose, in expensive clothes and with loose manners. A kind of archetypal professor who tries to benefit everyone. In a woman's chart, the appearance, on the contrary, is very slender, but this applies to young girls, those over 50 also have this stoutness, solidity. And indeed, with such a position of Jupiter, this is noticeably manifested in the appearance and manners of a person, since this is the 1st house in plain sight. But we also pay attention to the influence of other planets on the first house.
A person has this solidity, a sense of authority and importance. Involuntarily looking at him, you perceive him as successful. He takes very good care of his appearance. In clothing, it is very important that the clothes are of high quality, expensive, of some well-known brands. He will not go out to people just anyhow. And so that the hairstyle is neat and the hair is well laid, men love beards very much. This is like a sign of solidity. Possibly, expensive accessories at hand, he is unlikely to wear jewelry.
Jupiter in the 1st house is strong in itself and such a person is focused on growth, development, success. It is important to show and manifest yourself. And therefore, he is very striving to achieve great heights in society and feels that he is capable of this. Vain. But here we necessarily look at the totality of other volitional planets - the Sun, Mars, Pluto (sign, house position, rulers and aspects). Because if Jupiter is strong - the feeling of importance, that I deserve more, is always present in him, but if other volitional planets are weak, there may be psychological problems.
But if the other planets are also strong, the natal chart as a whole is positive, then the person achieves success, the achievement of the goal is real.
A person with Jupiter in the 1st house is open, tries to give advice, to benefit in some way. Such a position of a mentor. Here - I helped, I'm great! And a low bow to me. He loves admiration, approval from the environment, is susceptible to flattery.