Mercury navigator: Who is the man with glasses? What's his name?

From Mars, 19 years old, height 140cm, blood type AB, birthday on May 20th. The nickname Aru lives underground on weekdays and only comes underground when shopping. The job is to control the gravity of mercury and make it the same as the earth. Although he looks younger than Deng Li and Aika Zero, he is actually 19 years old. In fact, the average height of a person is very short. Although he looked like a petite boy, he finally grew a little taller. He speaks a bit like an old man. It didn't appear in the original work, but "the old man's cold joke" (I call myself "the advanced classical language of the earth") often appears in animation. Because it is so boring, not only Aika will tell him in the light: "Don't tell the old man's cold jokes". As a ground manager, although only semi-proficient, but the strength can not be underestimated. He was born on a floating island. He was childhood friends with Xiao and Woody, and he was also the leader of the three. He usually wears ordinary glasses except when he comes to the ground during the day. Although he usually stays in the dark underground, where he is afraid of the dark, he will be talkative because of fear, and his eyesight is very keen at night. Because he knows a lot about stars, he is often invited by Ai Ge Ling to participate in activities related to stars. [33]?