If you're looking for a meeting place or a good stop around ½ or halfway between Warsaw, IN and Detroit, you can try Napoleon, OH, which is about 1½ hours east of Warsaw, IN, or about 2 hours southwest of Detroit.
Other possible places to stop near the midpoint include Whitehouse, and McClure.
About ¼ or a fourth of the way, you can stop at New Haven, IN. This is almost an hour east of Warsaw, IN.
About ⅓ or a third of the way, you can stop at Defiance, OH. This is a little over 1 hour east of Warsaw, IN.
About ⅔ or two thirds of the way, you can stop at Sylvania, OH. This is about 2½ hours east of Warsaw, IN, or about 1 hour southwest of Detroit.
About ¾ or three fourths of the way, you can stop at Ypsilanti, MI. This is almost 3 hours northeast of Warsaw, IN, or almost an hour west of Detroit.
If you drive straight through without stopping at all, the total distance is 218 miles. The distances shown above don't include local roads to get into each town, so if you're planning a long road trip, make sure you factor in traffic and road conditions, rest stop breaks, and interesting detours along the way. If you're in a rush, you can do the trip with zero stops, and your total travel time would be around 3 hours, 29 minutes.