One of the best androids in fiction is Data from 'Star Trek: The Next Generation'. He is highly intelligent, constantly striving to understand humanity. He has a positronic brain which gives him remarkable cognitive abilities.
Well, in some comics, androids can be depicted as having the capacity to dream of love. It often depends on the story's theme and the creator's imagination. Sometimes it's used to add depth to the android characters.
Well, it varies. In some manga, androids might show fear depending on how they're characterized and the situations they face. But in others, they might not have that emotion at all.