ThomaTo

ThomaTo is the slash ship between Thoma and Kamisato Ayato from the Genshin Impact fandom.

Canon
Both characters do not yet have actual interaction in the game, as Ayato is yet to be introduced into the game as a playable character. At the same time, he is already mentioned quite actively in the latter's voicelines, so fans can make some data about their working and friendly relations.

Fanon
This ship gained some popularity even before fans could even see what Ayato would look like, as they already quite liked how loyal and intimate his mention in Thoma's voicelines was. Even though headcanon generally gives this ship the same servant x master dynamic as Ayaka x Thoma, the ship's fanfiction has some significant differences, as Ayato's personality seems to be completely opposite to his sister's.

For example, while in other ships Thoma was often portrayed as the active side due to his charismatic and playful personality, fans of the ship often see him subservient to the more dominant and intelligent Ayato. Although the latter's identity has not yet been fully revealed, Thanks to the already available to fans canon information, Ayato is often headcanoned as a confident, intelligent, cunning, and sarcastic young aristocrat. So, in fan art and illustrations, Thoma often tends to be depicted as a loyal but naive and pure servant being seduced by former.

Trivia

 * Since Ayato and his ship with Thoma gained some popularity even before his appearance was revealed, quite a few illustrations portray him as a kind of gender bender version of his sister, Ayaka.