New suggestion for English, adapted from the Bislama creole:

1st person pronoun = mi
2nd = yu
3rd = ðe ("they")

Combine for all the plurals:

yumi = 1+2 (you and me)
miðe = 1+3 (me and them)
yumiðe = 1+2+3 (all of us)
yuðe = 2+3 (y'all)
ðeðe = (all of them)

(Maybe yuðeðe for the singular/plural they distinction, too.)