Fawkes is still in the New Vegas game files

No TTW.

Edit: Since people keep bringing this up: I am well aware that FNV is built on 90% of FO3's assets. I just thought this in particular was pretty interesting, as it's a companion and a major character in the main questline of Fallout 3, reduced to a gutted remnant of old data. There are also not many named characters left in the data, with it being limited to generic NPCs like slavers, raiders, and Enclave soldiers, making this rather unique.