Exept from the robots which looks like with Ultron, Superior Iron Man (or Ghost Rider) mentioned again in Doctor Strange in the Multiverse of Madness.

In the first cast, Tom Cruise was Superior Iron Man in the film but for someone reason he didn't appear. There was an idea to see Ghost Rider as an Illuminati member but then directors realised that he was to powerfull or something like this and he will fight with Wanda a long time, so he didn't appear.

So, as a member who didn't appear we know only Superior Iron Man.

When Dr. Strange saw Illuminati we saw 6 chairs for all the members: 1. Mr. Fantastic, 2. Captain Marvel, 3. Mordo (formerly Doctor Strange from this universe), 4. Captain Carter, 5. Black Bolt, 6. ???? . He didn't sit there Dr. Strange from this universe because Dr. Strange was sitting where Mordo was sitting. So maybe Superior Iron Man???

(Hope to see Superior Iron Man in Ironheart, Avengers: Doomsday and Secret Wars and in the possible movies Superior Iron Man and Iron Man 4.)