Espresso is very light and down to earth but also very serious about assisting Colress in his research. She's interested in the same areas as him so from her perspective it makes sense to work together and get more work done between the two of the saving time in the long run.

Espresso is capable of indepent research but finds herself to be more productive working with Colress, at times she will go and pursue a smaller section on her own so he can do other things