He’s currently a complete enigma
Right, a lot happens in each episode of House of the Dragon but in the most recent episode a character called Prince Daeron Targaryen is mentioned, and I’m sorry but who on earth is that?! During episode two, Alicent and her father Otto Hightower are having a conversation when Prince Daeron is mentioned. Otto also discusses how Daeron is currently at Hightower in Oldtown and how he’s more well-behaved than his older brother Aegon.
Umm, so wait a minute that means that Daeron Targaryen is actually Viserys and Alicent’s youngest child in House of the Dragon, and he could be making an appearance in the show soon! But who actually is he in the books? Let’s find out!
In the books, he is regarded as the “gentlest” of all the children and is around the same age as Jacaerys. Viserys requests both Jacaerys and Daemon share the same nurse to help them bond but sadly he ends up hating his cousin just like his siblings. In the House of the Dragon, Daeron Targaryen is sent to live with Lord Ormund Hightower by Alicent and becomes his cupbearer and squire. And because he’s a Targaryen he obviously has his dragon named Tasserion.
In the books it’s not made super clear why he’s sent away by Alicent but he does return to help them fight in the war for the Iron Throne, so it sounds like they could be sowing the seeds for his return!