Which of the Princes will be the most susceptible to Dark Magic?
A thought as my brain goes through a plot I hope to write at one point. Here are my thoughts on the matter. This is less of who is more susceptible and moreso how they might be susceptible.
Geordo - I think Geordo, all things considered, can be more easily influenced by Dark Magic depending on how it's done. Geordo is less susceptible to subtle manipulation, but more susceptible to spur of the moment manipulation. He can handle and avoid sly and subtle acts, but if he's already upset or angry (or any intense emotion, such as his outburst in vol. 8), then the dark magic only needs to try and amplify those emotions. Fuel an already existing fire per say rather than start a new one.
Alan - for Alan, I think it would be more or less the opposite of Geordo. He's okay at controlling his emotions in intense moments (being able to control himself enough to not join Geordo in his outburst and rather be one of the first to snap him out of it), but perhaps not too skilled in avoiding subtle attempts. Alan's dislike also leads me to believe that he's getting better at avoiding subtle manipulation (cough, except when it comes to Geordo and Mary, cough).
Geoffrey - here's a fun one, because I do think Geoffrey might be fighting against dark magic somehow in the LN (pointedly Suzanna noting he's been developing dark circles under his eyes). Geoffrey is probably the one strongest against dark magic and least susceptible to its effects. Mostly because he's been likely researching dark magic incidents alongside Suzanna and that he's more aware of the dangers and effects. He probably needs to be whittled down somehow for dark magic to be effective against him..
Ian - and then we have Ian. Who, honestly, with what information we have on him, I think might be the weakest against dark magic. For one, he hasn't been in the sphere of dark magic like his brothers. Geoffrey had been researching it, Geordo had first hand experience during both Raphael's incident and Keith's kidnapping, and Alan had experience during Raphael's incident. Ian's the only one not directly affected or involved in dark magic. Selena was the only target and he only saw her after she recovered. He likely doesn't know the full effects beyond what it can be done through text. Two, how his personality is leads me to this idea as well. He's more reserved, and how he carries himself around Selena early on leads me to believe that there might be weak spots. He might be open to manipulation due how he tried to suppress his emotions during then. He might have some still lingering doubts as well afterwards (since his lack of care around Selena supposedly led to her manipulation by dark magic).
So, those are my thoughts, what do you think?