Which "side characters" to Alexander's story are you most interested in both as a historian and as a fiction author?
Well, Hephaistion is obvious. But my interests as an historian and as a writer are slightly different.
As an historian, I could wish for a more unbiased account of Perdikkas. Of Alexander's age cohort, he had the highest appointments at the youngest age. I suspect it owes to equally high birth. We aren't sure, but his father Orontes was probably the prince/once-king of the canton of Orestis. In the sources, he's poorly treated in part due to bad press from the Successor Wars.
Reputedly, he was arrogant and high-handed, and his own officers (led by Seleukos) killed him in Egypt. But was he that bad, or are these reports part of that bad press (and Seleukos's and Ptolemy's ambitions)? If he were a prince, perhaps his arrogance had cause. Alexander seemed to think he was the most competent of those who remained in Babylon and gave him the ring. Would he still have got it if Krateros hadn't been sent away earlier on his own mission? I suspect not, but we just don't know.
And then there's Krateros, who may also have hailed from Orestis and was probably a cousin of Perdikkas. But, again, we can't be sure. I'd like a better sense of Krateros, as well, to evaluate his place at court. Like Perdikkas, our sources attach a bias to him, but in his case, a positive one. I'm as suspicious of that as I am of the negative one assigned to Perdikkas.
After that, it's largely the women. Olympias, yes. But even more Kleopatra, Thessalonike, and Kynanna. Also Philip's mother Eurydike. I expect THAT woman was someone to be reckoned with. As was Audata, Kynanna's mother. And Hadea, the daughter/granddaughter. Roxana, and Darius's daughters.
Oh, I'd like to know a little more about Parmenion's family--where they came from originally (Pelagonia or not?), and the two younger sons. Philotas sucks up all the air in the room.
Last, I wish we knew more about Darius himself: who he was before being raised to the throne. My friend, Scott Oden, has decided to work on a novel about Darius, which I expect to be spectacular. He has a real talent for detailing the losing side with compassion and insight. If you've not read his novel, Memnon, I recommend it, or Men of Bronze. I think he'll do a great job giving Darius a fair shake.
Now, as an AUTHOR, my interests are similar, but I get to include fictional characters, such as Kampaspe. She may be mentioned in our sources, but was almost certainly a Roman-era invention. Also, you'll get to meet a priest of Ammon who'll travel with Alexander. While also fictional, Alexander must have had such officiants, as he regularly included Ammon in his sacrifices. And, of course, Kleopatra will continue as a voice and window on what's happening in Europe while Alexander is out gallivanting around Asia.
Last, there's a fellow in Athens you'll get to hear more about: Phokion. Plutarch wrote a life of him, in which he's portrayed as the last respectable Athenian general, and was nicknamed "the Good," in antiquity. In the novel, Hephaistion meets him in Athens, when he's there the second time, and he becomes one of (several) people Hephaistion corresponds with, besides Aristotle and Kleopatra.
Oh, I forgot…not a side character of Alexander, but I REALLY REALLY wish we knew more about Alexander (I) “the Golden.”
