your boyfriend! after stumbling into you on your travels, xiao became very interested in you and your story, and how easily you made friends with everyone. he's an extremely reserved person that has stayed away from mortals for eons, but has developed a curiosity for finding out more about them because of you. xiao, secretly of course, is very protective over you (hence why he lets you summon him) yet always keeps his distance due to his intense karmic debt. he does not understand human customs.