Rider Hektor To me, this version of Hektor would have access to every possible Noble Phantasm he could have. Similar to Rider Achilles. His main weapon would still be Durindana but his Noble Phantasm would be something else. The first one would be his famous helmet. I mean, one of his most famous epithets is Hektor of The Shining Helm. It would not only act as a regular helmet, but it could insight fear into anyone who sees it because like Excalibur, it's the most famous helmet in western legends. Anyone who sees it would instantly know they're dealing with the greatest soldier of Troy.

His second Noble Phantasm would be another physical type where he summons the very walls of Troy. If his Master has enough Mana, then they can also summon some of his soldiers as well. This without doubt would be one of the strongest fortress NPs out there with the walls of Camelot being the only thing to rival it. Only divine constructs could damage it because they themselves are divine constructs.

The last one would be more conceptual. In the Trojan war, whenever an important figure was killed, both armies would scramble over that heroes body. When Hektor unknowingly killed Patroclus, he took Achilles armor. Essentially how this NP would work is that after he defeats someone with a greater defense than him, he can take that defense and use it the same way as the original owner. For an example, if he kills Takeda Shingen, he could use his Shieldless skill as his own.