Jupis tends to be somewhat arrogant and presumptuous, as well as a little impatient. He also shows flashes of insanity. However, he is also a genius, especially when it comes to technology. He also has somewhat of a temper, though this is mostly due to his addiction to coffee and his lack of sleep because of it. Despite caring about his projects a great deal, he also values people such as Tony, his former lab assistant. His home planet seems to be Zerard, as he remarks before leaving with the crew of the Dorgenark that the police have his house staked out. Spoilers end here.