I don't really do any technical charts (like height or clothes or every single facial expression they could possibly make, what-not. I find those things fairly easy to keep track of & tackle when the time comes).
But I do make character sheets - simply to make sure I don't stray too far from the 'feel' (both visually & emotionally) of the original characters concept. I also may add certain details that may not be present continuously throughout the story, yet still need to remain consistent, such as weapons or different forms and what not.
(Some examples being:
I think it's a good idea to make some character concept sheets. (heck, for every character I went through at least 2 or 3 different concepts before settling on one for the final character). It's important to remain consistent, and character concepts you do do (if you do them well) can also be a source of inspiration & motivation. Helping the character stay fresh and alive in your mind.
For things like keeping track of clothing and expressions and such, I'd just piece together a bunch of scenes I've already drawn in my comic, and have that mash-up be the 'reference' for those outfits, designs, characters and places. More efficient, I find. And by making that 'mash-up' I won't have to be going back digging through old pages trying to find reference. I also do this for more minor characters that won't be making a lot of appearances.