Jupiter in Aries expresses joy openly. They enjoy change, freedom of movement and opportunities to break out of routine. Challenges stimulate their imagination and invite them to look at new possibilities.
When they exercise authority, they may look like a military commander at the head of a team they expect to be efficient and willing. They give instructions quickly, decisively and confidently, and they like them to be understood the first time.
In positions of power they tend to be direct. They prefer to act and to communicate what they expect without beating around the bush, although that speed may require them to make sure they have been understood.