Quoting in research is used to point out specifically what someone said and in the exact way that it was said. If the quote is credible then the research is credible as well if you cite properly and it makes sense. Citing is important for avoiding plagiarism. Everything that does not fit that description might fit the answer you're looking for.
This isn’t a question but you should take the risk and cut your hair!!
The literary pespective is based on the style and grammar and such things as alliteration and use of metaphor, irony etc whereas the historical perspective is based on how the thing developed through the years ie based on historical facts or on a fictitious history of events and their sequence and meaningl
Character perspective: how the character sees things