Some other things to consider:
What is the favorite drink for a readhead?
What is a redhead’s favorite food?
What is the best car for redheads?
What is the best job for readheads?
Any one of us has relatively few experiences and it is tempting to try to classify responder types by their most obvious features, like hair color. However, with small samples, patterns are likely to be due to chance.
There are many other possible ways to classify responders. This is explored a bit in my old thread
If you’re really interested in a particular redhead, perhaps you should consider the characteristics of her personality?