Clean Up the "Marker" Tag

The marker tag has been used for various things:  
(1) Marker pens (Related tag: marker pen) (Also marker writings/drawings, but I’d rather ignore them.)  
(2) Artworks drawn with marker pens (Related tag: markers, marker drawing)  
(3) Dead Space markers (btw there’s a red marker pony)  
-(4) The oc Marker Pony fixed.  
(5) Record marker (only these though)
 
For (1) and (2), there was a previous discussion. I think there should be two separate tags, but I have no suggestions for the tag names.  
For (3), I propose creating a new tag like “marker (dead space)”  
For (4), let’s just correct those. Changed them to oc:marker pony  
For (5), I don’t know, remove them?
 
Ending.