Board Thread:General Discussion/@comment-29645420-20160815201731/@comment-27701762-20160816022239

Aicilespear wrote: Though I'm intrigued to the fact that feeling hatred and joy in killing is not in the list of things you can't feel when you have no soul.

I guess soul doesn't necessarily contain all emotions. I think that's ultimately the case. A lot of people have pointed out how Flowey exhibits reactions that mirror fear and something like anger and (potentially) disgust. Flowey does specifically state that his compassion is gone and he wasn't able to feel anything for anyone, but not that he couldn't feel anything at all. Love and compassion seem to be the most important feelings that are missing.