I havent read the replies, but Im sure someone has told you every kid is different. Even those from the same family.
DS7 was never afraid of the characters. When he was two, he would only spend a short time with Santa, but every other character and Santa at every other age has been an enthusiastic go.
DS4 was terrified of all characters from the time he was about a year old until right before his fourth birthday, which, btw, was when we had our last Disney trip. Two weeks prior to our last Disney trip, he was flipping out at the book fair because Clifford came to close. He liked the characters from afar, but not near him. At WDW, he could have cared lessthere was Mickey Mouse, Peter Pan, Buzz Lightyear, Goofy, Donald Duckhe was getting autographs and pictures. Surprised the bee geezers out of me. Now, when he was 15 months, half way through our trip he warmed up to the characters, except the face characters. The Mad Hatter was telling us that they see that a lot, they like the full characters or the face characters, but not both.
We chose not to push it because, what difference does it make? You have to seek the characters out; they dont come to you. While he was frightened, we found that we just seated him in the most distant spot at character meals. He could see the characters, but they werent too close. If you tell the characters as they start to come near, they are wonderful about staying away. My oldest loved having characters to himself. The characters were willing to wave over at us, from our safe distance. And he loved every other aspect of the trip. In the end, we left everything up to him. We bought him the autograph book and asked him. We took each character as they came. We never expected him to want to see one just because he saw the previous one. Additionally, we let him wait in line and if he wanted to back out when we were next, then that would be fine.
DS2 didnt like characters a whole lot, except Disney ones. Now that he is getting closer to three, he is warming up to other characters. He was just over excited to see characters on our last trip, but flipped out over Santa.
Now, I have eight nieces and one was terrified of all characters, including Santa, until she was close to nine. I honestly think she still doesnt like them, but just isnt terrified anymore. None of the others were ever frightened nor ever was my nephew.