Her first companion. Ai asked him to join her and gave him a purpose to his life. Like all her companions, he is very important to Ai. Family at this point.

She's glad to see him. But at the same time she worries about him here. She doesn't want to see him droned either.

She's also a bit worried about what he will think of her here, as she's had to change rather a bit to live here. Having friends, emotions, ...a boyfriend. etc.