How Will the Character Animate?
If the character will animate, definitely make sure that you get some information from the animation department about what is needed and expected so your design will conform to the specifications.
Do You Really Need to Remember All of This?
Unfortunately, yes, you really are expected to remember all of these issues each time you design a character. Other issues will no doubt arise with each character design project. These are critical parts of the process.
It is important that these questions be your constant and conscious companions as you design your characters. Eventually, they will become second nature, and you will not be aware that you are answering them as you design; rather, their influence will always show in the underlying structure of your designs.