Hi! I have experience with finding the Midnight Panther, however I only found her twice. I found her at different times once I found her at around 2 pm the other time it must've been 6 pm central time (I'm in Texas currently). I found her maybe 2 months apart (I didn't keep track) The key to finding the Midnight Panther would be to keep checking! Every spare time you can! I would log out there on my MAIN who needed the mount that way I can be the first to get to her.
I heard she only spawns every 3-4 days in one spawn or the other 2 spawns (I cannot confirm this but many people who check her told me this). I also heard she goes invisible so it's best to make sure you do a scan slowly and surely, I use utana vid or a stealth ring to make sure other creatures don't bother me. Also from what I've been told is she can be lured to pretty much anywhere, but chances are if she's lured it's because someone did it and she runs really quick. So check all 3 spawns with an open mind that she can be anywhere.
Also, make sure you use a music box and not a whip as this spawn is so rare you don't want to risk not mounting her. So my best advice: Always keep checking! Log off at any of the three locations (I'd log off at Grizzly Adams or the Bridge connecting Port Hope to Ankrahmun)! Check multiple times a day whenever your not busy even if you don't want to!
I've found the midnight panther exactly where it is marked on the maps on 2 of the 3 locations. The two marked close to the banuta hole is where I found both of my Panthers. I didnt find one however by the carni hole yet. I'm sure theres locations of the midnight panther that aren't known so it doesnt hurt to check around as mentioned previously the panther can run and be lured.
This question is quite similar to:
https://www.tibiaqa.com/1501/where-to-find-midnight-panther-and-how-to-tame-it?show=1501#q1501