This sounds quite interesting. I am sure that members here will have strange tales to tell to provide some new ideas for your game. I can offer two, neither are earth shattering, but we do lead a quite life so for us they were interesting!
1. Two years ago we had a truckload of Autumn leaves delivered, to store and let them rot down to leaf mould. Out tumbled a mole, alive and rather bemused, but instead of being the usual velvety black clou she was pale grey. We carefully transferred her to a vacant plot next door, and this season we have been overrun with moles tunneling under our crops
2. One clear moonlit night last Winter I spotted a ghostly figureof what looked like a WW1 nurse, on a nearby plot. It did make my heart beat a litle faster, but when I got closer she disappeared. Next day I went to check it out and in the shed on that plt, rigth next to the window, was a mannequin dressed in an old army uniform with a white headscarf on. It has been so clearly visible due to the angle of the moonlight, and no leave son the trees, which would have screened the shed from our view earlier in the year