Hmm… Depends on if you find, or would classify, these habits as “flaws”.
Cail loves his old hickory fisherman’s pipe. He inherited an old ivory pipe as well, but the hickory pipe is his. He didn’t whittle it himself, rather it was made for him, and gifted to him long ago by someone very special. It’s one of the few objects that’s precious to him and he’s fastidious about the pipe’s care and maintenance. It’s something he smokes often, usually by himself or in appropriate locations. It’s certainly not an addiction, but it is a habit. He misses it when he’s forced to go without a smoke, but he doesn’t go through mood swing withdraws or anything of the sort.
He likes to drink. Not to get drunk, but he does enjoy a light buzz now and then. Enough to ease the worry and lighten the spirit. Cail enjoys the taste of a good Whisky while he relaxes, and sometimes while he smokes. He also likes a good thick Lager when he travels, especially when he’s out fishing for long periods.
As way of character flaws, well, he’s presumptuous. He believes in the goodness of people and is willing to help out when and where he see’s he’s able, regardless if his aid is asked or not. He’ll simply pick up and start doing, presuming he’s being of aid, regardless if he actually is or not. He’s apt to remain silent and observe when he’s in a public or otherwise unfamiliar situation, gauging if getting involved is really necessary. He doesn’t hold a high or important opinion of himself. He just enjoys what he does and he’s good at it, usually.
Spend enough time with him and you may get a peek behind his usually cheery mask. Privately he’s actually quite serious, even dour. He’s very much a grumpy tired old Gnome, but honestly enjoys playing to the grandfatherly troupe when the chances arise.
Buried deep below it all, I suppose, his work with the Shadow/Void has brought out a cruel, cold, merciless streak in him. It’s not something he’s proud of, and certainly not something he enjoys. It’s something he’s learned to come to terms with however, recognizing that to some degree that streak has always been there. He’d just learned to hide it in his youth and focus on being a good natured, kind hearted individual. It was a darkness that he’d been able to deeply bury. His knowledge and fairly liberal use of the Shadow only brought it out. The Void would later spur that side of him onward, amplifying that negative nature until he learned how to wrestle back his self control. Reclaim his dignity and attain a mastery of himself. Thankfully, it was a time of solitude where he wasn’t around anyone close to him that he might hurt or that would witness that struggle; and also that he had a strong ally to help guide him through that period.
It’s a darker side of him that few rarely ever get to see.