"Even when there are multiple founders, somebody is in charge"
Co-founders don't necessarily mean "equals." You can have co-founders that are less involved than yourself (still giving you the value of a co-founder, without requiring them to be equally as invested as yourself).
Another thing to think about is ownership of the idea- almost by definition, the person who comes up with the idea will be the most involved. If you're looking for a co-founder, it will be much easier if you don't yet have an idea, and come up with one together.