Overly invested in a lot of things

Obviously with the nature of F&B as an in-universe history book their isn't a lot to actually go off of regarding their dynamic and what Ormund's personality was like. We know what they did during the war and a bit before that along with Daeron's personality prior to it as well, but that's basically it. Because the writers chose not to introduce Daeron in season one this episode had to act as his official introduction in the show after being an unnamed squire in episode one. They also had to continue building up Ormund as an opposing force because at this point in F&B, he and Daeron were the main threats to Rhaenyra's rule.

With all that being said, I really do think that the writers went with a fascinating route. Daeron calls him "sire," a word that means both "father" and "lord," which basically positions Ormund as his primary authority figure. He's also been raised by him since he was a baby, which is obviously an in-universe excuse the writers gave to not have him or Ormund in the show till now.

But just because Ormund's raised him since he was little doesn't mean that their relationship is a very good one. Their dynamic is clearly abusive. Daeron very clearly recognizes when Ormund is about to fly into a rage, which means that this likely happened at least semi-regularly back in Oldtown or while they were on the march to Tumbleton. Ormund also hates Daeron's Targaryen side (which could further lends credence to the theory that Daeron's hair is dyed), including not wanting him to be around Tessarion. He uses the fact that he raised Daeron against him as a manipulation tactic.

I liked that they had Tessarion try and protect Daeron as well.