Our 8 month old kitten has recently discovered the out-of-doors. Recently he came home with his otherwise straight ear bent at the tip. This ear seems to be warm to the touch relative to the straight ear. Has he broken cartilage in his ear or might he have a neurological problem?

Best to take the kitten to a vet to find a correct treatment.
It could be nothing but it could also be serious and may have permanent damage to the ear.