His appearance back at CT was short lived and had been long forgotten since for me it was a long time ago. I don't think he was voice acted either, that gives a character more personality than just reading everything in your head which makes the character seem flat (unlike Hildibrand ofc.) To me he came across a bit immature and inexperienced and only interested in exploration, didn't look like he had much of a personal interest in the WoL unless I missed something since there was at the time an overwhelming number of side quests that it was easy to lose track of what was going on at any one time. I was saddened to see him choose to seal himself away though, that did touch me and I thought his part in the story was over, so like so many other NPCs that come and go I didn't have an emotional attachment to him. However his personality is much more noticeable in ShB since he's the main focus of the story so far and has been very well developed, he is more maturer and has a much more deeper personal interest in the WoL. To be perfectly honest I don't know what it is that's really drawn me to his character in such a way, I thought maybe it was the voice acting but just seeing him standing in the Oculus makes my heart skip beats.