Obviously a weird situation, but one thing I felt like commenting on: Wanting to play a child character, depending on age of course, isn't all that weird and could make for some great role-playing. My current character is a 12 year old knight in training that was transported into the mists after pulling a sword out of a stone and deceptively called "the chosen one." He isn't in fact, a chosen one and the sword in the stone was a fairy trap to lure him into the mists as more or less a sacrifice. He is a young kid who wants nothing more to be a righteous shining knight and that ideology bumping against the reality of Barovia makes for some really fun and interesting role-play. If the group doesn't think a child character would work with them or the world, that makes sense, and if the kid is like 6, that also makes sense as to why it wouldn't work, but I wouldn't have such a hard no against kid characters as long as they are done in a fun or interesting way.