2001 Honda Odyssey transmission leak
That sucks, should probably get it fixed, or at least a quote on fixing to see if it’s worth fixing.
How many miles on the vehicle/transmission? What shape is the vehicle in otherwise? Any other problems? How bad is the leak (i.e., puddle in the driveway, quart a month, etc.)?
I have no idea where the leak is coming from. Most auto transmission leaks are comparatively simple and inexpensive to repair.
The largest expense would be if the front pump seal is leaking. That would require removal of the transmission from the car. Seal is cheap; labor is not as it’s labor intensive.