Open up your outliner or hypergraph and see if you can find the missing parts of your character. If not, then you must have accidentally deleted them. If you do see them, try the following.
1. Click on the object in the outliner (or the hypergraph) then goto Display>show>show selected.
2. if that doesn't work, then in the view panels menu bar, goto show>isolate select> and then make sure view selected is not checked.
If that doesn't work, I'm clueless unless maybe the geometry got moved off the screen really far away.
Don't be satisfied with what you can do but rather strive to do the things you can't do!
Exceed Expectations!