It's possible that RAM is the issue, but unlikely as it only uses around 180 MB on my device. My laptop with a worse CPU than yours seems to run it fine as well.. I'm really at a loss. Would it be possible to record a short video of exactly what's happening? Maybe visualizing it will help me figure it out.
It would make more sense if the character never showed up at all, but the fact that it shows up, then disappears is what's confusing me.
Another thing to try would be to run the game through the terminal so all of the output would be shown. To do this, you can shift+right click on the folder where the game is stored, and it will either be (open in terminal, open in command prompt, or open powershell window here). Either of those options works the same. Then, you can just enter "./Feraline.exe" and it will open the game. After the character disappears, screenshot everything that was logged into the console window you opened (before closing the game, as closing it spams the "X was leaked after closing" errors that are redundant).
Thank you for your patience, I really hope I can get it fixed soon. It's just very difficult to fix with no idea of what's causing it, and no way to recreate it on my side. :(