Ferro is still one of my favourite stallions. He is prepotent for passing on a powerful engine behind with a super ability to sit. The canters are usually very good.
Speaking from my personal experience of three full siblings, two are very much alike in type, the third has a larger head and big ears, but she is a big mare and her head suits her. She has more of her mother in her, but the Ferro influence is still clearly visible.
All my Ferros are very forward with tremendous work ethics and very bold - kind of like riding the energizer bunny. One sold some years ago, so I am speaking from earlier experience with that one. They are very sensitive to the aids - so don’t do well with a rider with harsher hands/aids. My Ferros already have the rider pegged before a foot is in the stirrup. Earning their respect starts on the ground - they will try just little things to see what they can get away with. Patience is something they must be taught. They may become hot under saddle but it is a good hot - they are trying so hard. Mine are all very powerful which could be intimidating for a rider not used to this. I’ve said it before, Ferros don’t suffer fools gladly - they are highly intelligent and very athletic, and can be opportunists. Treat them fairly and give them a skilled rider, and they will be a devoted partner.
Donella, crossing Ferro with your mare sounds interesting. I think Ferro does best when crossed with a mare with blood and size. He doesn’t pass on long legs, so mare should have those, and hope for the best.