1. Caster won't find any of the spells that gods were dealing with in Japan in the sacred locations he checks out in Ireland, with the exception of locations that are dedicated to gods that are currently active in the Far Shore. In other words, Aine, his own shrines/sacred locations, etc. There are definitely a lot less than there were in Japan, and they're not at every location, but there are some.
2. Yes, "ayakashi"-like spirits exist worldwide, and tend to take on appearances related to local beliefs and fears. He might encounter spirits that reflect traditional beliefs about malicious entities in the area, or even ones that reflect modern urban legends.
3. Yes, every location in the world has its own heavens and pantheons (during the event in which gods formed connections to their shrines in other parts of the world, they had the opportunity to interact with those pantheons.) Since he has a history of worship in that area he would be able to make contact with them.
4. As long as you paid for the small item regain, if you wanted him to discover it in a meaningful place on his trip or have it appear near him during his trip, that would be fine! Just mention it in your regain request.
Re: I am so sorry this is so long
1. Caster won't find any of the spells that gods were dealing with in Japan in the sacred locations he checks out in Ireland, with the exception of locations that are dedicated to gods that are currently active in the Far Shore. In other words, Aine, his own shrines/sacred locations, etc. There are definitely a lot less than there were in Japan, and they're not at every location, but there are some.
2. Yes, "ayakashi"-like spirits exist worldwide, and tend to take on appearances related to local beliefs and fears. He might encounter spirits that reflect traditional beliefs about malicious entities in the area, or even ones that reflect modern urban legends.
3. Yes, every location in the world has its own heavens and pantheons (during the event in which gods formed connections to their shrines in other parts of the world, they had the opportunity to interact with those pantheons.) Since he has a history of worship in that area he would be able to make contact with them.
4. As long as you paid for the small item regain, if you wanted him to discover it in a meaningful place on his trip or have it appear near him during his trip, that would be fine! Just mention it in your regain request.