Brent Spiner made a name for himself playing the famous Lt. Cmdr. Data in Star Trek: The Next Generation. The role of Data demanded that Spiner be devoid of all emotion, but luckily Data wouldn't be the only character he played. Since debuting as Lore in Season 1, Spiner has been able to play more characters within the franchise.
Brent Spiner would go on to play Data and Lore's creator, Dr. Soong, and then play every subsequent male in the Soong family. Throughout multiple different Star Trek shows, each Soong has had various levels of development which make some better than others.
B-4
In Star Trek: Nemesis, the Enterprise tracks down a positronic signature on a planet near the Romulan neutral zone. There, they discover B-4, a prototype android that Dr. Soong created before (get it?) he created Data. Turns out, B-4 was a trap for Shinzon, the new leader of the Romulan Empire, and he nearly crippled the Enterprise, before Data figured it out.
B-4 was less sophisticated than Data in many ways since he was a prototype. Brent Spiner played him with this child-like wonder where even little things were completely new to him. Unfortunately, the character doesn't receive any kind of development. There's a sense that Data could still live in B-4, but it wasn't meant to be.
Lore
Data's evil older twin brother Lore was gifted with the one thing that Data wasn't, emotions. He was responsible for the destruction of the colony that he and Data were from and would go on to cause much trouble for his brother and the crew of the Enterprise. He even stole the emotion chip that Noonian Soong made for Data. After an altercation with the Borg, Data was able to deactivate his brother.
To put it bluntly, Lore has a screw loose. Lore's emotional capacity was his undoing, it caused him to become unstable and he saw himself as superior to humans. Lore was prone to jealousy towards his brother and felt like it was his right to rule over anyone who stood in his way. He was truly an evil entity.
Adam Soong
Season two of Star Trek: Picard, one of Reddit's favorite Paramount+ shows, has introduced audiences to another ancestor of Noonian Soong in the form of Dr. Adam Soong. Adam Soong was a geneticist who was desperate to find a cure for his daughter's disease but couldn't since genetic experimentation was illegal after the Eugenics Wars. He's approached by Q to do something that hasn't quite been revealed yet.
The Soongs always seem to be brilliant scientists, but Adam seems to have a dark future ahead of him. Somehow he becomes the face of the evil Confederacy since it's his voice in the second episode that proudly proclaims "a safe galaxy is a human galaxy." Even if his motive was altruistic, he was clearly xenophobic, which changed the course of human history for the worse.
Noonian Soong
Much like Jeffrey Coombs, Brent Spiner has played multiple characters in Star Trek. The creator of the Soong type android and believed dead until the Star Trek: The Next Generation season 4 episode "Brothers". Dr. Noonian Soong had spent his life perfecting artificial life and felt like Data was his most perfect creation. His failure early in his life lead to Lore but his regret later in life led him to want to fix the mistakes he made, starting with giving Data emotions.
Dr. Noonian Soong was a narcissist. He may have had plenty to regret later in life, but his mistakes led to the death of his wife, the destruction of his colony, and ultimately his own demise. Data succeeded where Dr. Noonian Soong failed. If Soong could have seen past his own narcissism, things could have gone very differently.
Altan Inigo Soong
Star Trek: Picard season one surprised viewers with the revelation that Noonian Soong had a biological son. Altan Inigo Soong helped Bruce Maddox, who was introduced in one of the best TNG episodes of all time, create new androids after the Synth ban in the Federation. He also was instrumental in creating the Gollum body that Picard would transfer his mind into.
Altan Inigo Soong kind of comes out of nowhere, since there was no mention of a biological Soong child in the entirety of Star Trek: The Next Generation. He looked at his creations like his children and was only ever interested in protecting them from the Federation and Romulans. Also without his help, Picard would have died. He ended up being far more kind-hearted than his father.
Arik Soong
Star Trek: Enterprise had a three-episode arc where the Enterprise crew needed to team up with Dr. Arik Soong to stop his genetically enhanced "children." Arik Soong believed that the augments wouldn't all turn out to be like the infamous Khan, but the actions of his "children" didn't help much. He aided Enterprise in the unfortunate destruction of all the augmented humans. Afterward, he turned his back on genetics and began work on cybernetics.
Star Trek: Enterprise might not be the best Star Trek series, but the three-parter with Brent Spiner is well-liked. Arik Soong was egotistical but didn't appear as narcissistic as his descendent. He genuinely cared for the augments and wanted to see them free to live their lives. He always felt that the ban on genetic experimentation was short-sighted, and discovered all sorts of cures and improvements to the human race, that would sadly never be seen.
Data
After Lore was dismantled, Dr. Noonian Soong created Data, one of the most beloved characters in Star Trek. Data served on board the Enterprise-D and E as the second officer and often helped in various missions. His importance to the crew and to Picard was invaluable. Sadly, he sacrificed his life to save Picard and the crew of the Enterprise-E in Star Trek: Nemesis.
Data's entire goal was to grow beyond his programming to become human. When he finally was able to install the emotion chip, he managed to gain that next step that had always alluded him. Even though for many years, he was played as an emotionless android, his character growth was some of the best the series ever had. Data was a special character, one that will be fondly remembered for decades to come.