[ What kind of scents/smells does Geto enjoy? ]
I do write about him as a practising Buddhist monk, therefore a lot of his Cult and a lot of his shows inside of his Cult have to do with rites and rituals from Vajrayana Buddhism, in which scent offerings and rituals have a high place. A lot of times, when it comes to any direction of faith in gods, specifically of big religions, offering scents is combined with great benefits: delighting deities, purifying evil, etc.
And due to being a practitioner, Suguru grew fond of the smells and fragrances that would be used like that, purifying and 'cleansing' those that need it [ specifically because he sees non-sorcerers as monkeys who would need to be cleaned from all that stuck to them ], as well as the rooms and the auditorium where any rituals and sacrifices would take place, usually being embellished and purified by smoke from incense. That incense encompasses smells like nutmeg, camphor, sandalwood, and musk; the typical smells that are used in traditional Buddhist texts he would also use for his own Cult and tries to keep them as cleanly traditional as only possible. He does dabble in different forms, however, sometimes would switch it all up, and use Tibetan texts, where again we have sandalwood, but also juniper, agarwood, pine, and vetiver [ smells like dry grass on a warm day btw ].
In general, all of these cleansing, very pleasant, warm smells are his favourites. He got used to it due to his beliefs and has grown to love them over time. They calm him down, specifically when having to deal too much with 'humans', and they just remind him of the goal he has, of the path he took and travels on and that his life has a purpose, specifically when looking at his Cult family.
When it comes to other people maybe? Aside from the listed above, he has a particular fondness for sweet and citrusy smells, a fact he won't explain if asked after but something he just enjoys when it comes to those around him, especially those he lets physically close enough to be able to catch their scent at all. Anything fresh and comforting, anything that reminds him of the past with those he loves also works particularly well.