seemed to me characteristic 中 characteristic 的词性和含义问题？

Dirk Stroeve agreed to fetch me on the following evening and take me to the cafe at which Strickland was most likely to be found. I was interested to learn that it was the same as that at which Strickland and I had drunk absinthe when I had gone over to Paris to see him. The fact that he had never changed suggested a sluggishness of habit which seemed to me characteristic.

句尾which seemed to me characteristic.

1）正常语序是不是which seemed characteristic to me ?

2）这里的characteristic 书上翻译成了“个性” ：对我来说，这是他的一种个性。

显然，书上认为characteristic 是名词. 可是如果是名词，是可数名词，应该是which seemed to me a characteristic.

所以，我感觉应该是形容词，应该翻译成：对我来说，这是他特有的。不知对否？