Some of these shows were deemed not popular enough to release toys. Many were planned.
- Orbots toys only existed as prototypes and never made it to market.
- Galaxy Rangers did have toys, but only in Europe.
- Ulysses 31 had toys.
- Thundarr the Barbarian had toys in prototype but were not released.
The other ones you listed, do not fit into the type of show that would have "action figures" produced.
Official U31 merchandise was completely nonexistent in the United States, same w/ Galaxy Rangers- That's why I mentioned 'em. I'm aware of the scrapped Godmarz ripoff toy from NBC's Orbots, lol.
Spartakus, as a series w/ Euro science fictions motifs, boasted literally dozens of exotic, and memorably unique character, vehicular, and backdrop designs that would have lent themselves very well to action figure & accessory representations.
Nice Union Fighter Blockman decorations in your sig photo man, btw. I have quite a few of those 5mm port bastards in storage myself.