Character Name & Journal: Jiaoqiu (flavourtown)
Character Canon: Honkai Star Rail

Can Sunday Tune your character? Absolutely! He should be able to do so with relative ease, as Jiaoqiu doesn't have anything that would interfere with it
Are you okay with Sunday sensing your character's emotions? Yes! Jiaoqiu is mentioned as having emotions that are somewhat 'frozen', so I think they'd be fairly small and hard to sense, but possible nonetheless
Are you okay with Sunday reading your character's surface thoughts? Yes! No doubt Jiaoqiu is one of those loud active thinkers, so he probably natters away about various topics at any given time
Are you okay with Sunday potentially prying deeper at some point? Yes!
Are you okay with Sunday speaking to your character telepathically? Yes!
If you're cool with Sunday tuning them, is there anything you'd be interested in playing with at some point? Jiaoqiu is most likely a Self-Annihilator, so it'd be interesting to play with the idea that that affects his thoughts and emotions somehow! Drained of some amount of colour, maybe, or just more faded in texture than others

Anything else? Questions, comments, concerns? Please feel absolutely free to have Sunday do his weird telepathy at any given moment in our threads 🫡