The dubbed voice in LGIEF is very similar to his real voice. I had to listen to a video that compared him saying the same lines in a BTS to that scene in the drama to hear the difference. I think Ding Yuxi could probably do the dubbing himself, but it's cheaper to have a voice actor do it.
If bubbly balls of sunshine heroines aren't your thing and you want to give another xianxia drama try, I suggest in no particular order:
Till the End of the Moon (first 25% was amazing, but then it becomes a trainwreck of misunderstandings. And by the 3rd story arc, FL becomes someone that relies on ML's love to forgive her when she betrays him. In the novel, even though he's the emperor, she's a cultivator, a warrior at her core even if she doesn't have full access to her powers. A mortal emperor is nothing to her, and she's outside of his sphere of authority.)
Back from the Brink (super fun to watch until ep 16 when one of the screenwriters left. Once ML gets over that lengthy patch of not talking (ep 16 to 18), it goes back to being funny, but pacing is not great as early episodes)
Fangs of Fortune (has a super attractive cast. 10/10 in eye candy. It's group of friends cracking jokes, but has a very slow-moving plot)
A Moment But Forever (read good things about the characters and the plot, but its called xianxia for the middle-aged i.e. no eye candy)
If you don't mind angst upon angst and want to see Ding Yuxi in a high ponytail again, he has a guest role in Love in Pavilion (a collection of short love stories) for a few episodes. I think you can start watching from ep 19 or 20 without being confused.
Not xianxia, but fits your requirement of non-cutesy heroine:
Go Go Princess (a playboy that transmigrates into crown princess. I love that the show doesn't take itself seriously)
Summer's Desire (2010 version) Can watch it here https://www.youtube.com/watch?v=UJobG0rx2eA (It's a super entertaining trashy melodrama. Huang Xiaoming's screen presence is so intense that his romantic scenes feel like an uncomfortable predator and prey situation, but Barbie Hsu can bring the same level of screen presence when the role calls for it. They feel like two wolves circling each other. So fun to watch them interact.)
How Dare You?! (an OI donghua. The animation is janky and takes a while to get used to, but ML's voice is soo good. I simply looked away from screen and listened to their voices.)
