The ornamental design for a protective themelipguard and chin guard, as shown and described.
FIG. 1 is a left front perspective view of the protective theme lip guard and chin guard with the message conveying a theme, with the lower edge of the lip guard, abutting the upper edge of the chin guard, showing my new design.
FIG. 2 is a plan front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is an exploded view thereof.
The broken lines form no part of the claimed design.