So, if we're living in the post-Avengers world of brands IP, who is the famous and beloved characters of D&D? Admittedly, thier IP stable is smaller and less well known than Marvel, DC, Star Wars, or similar, but who would be the characters to build the brand around in terms of t shirts and action figures and lunch boxes.
To start:
Drizzt is the natural starting point. I don't think any other character has as much name recognition. He's like Superman; loved by some, hated by others, known by all.
Drizzt's buddies (Buernor, Wulfgar) would be easy to sell with him. As would his stable of nemesi (Artemis, etc).
Eliminster.
Raistlin and the Heroes of the Lance. A bit harder sell due to the different world, but probably the only rival to Drizzt in name recognition.
Strahd Von Zarovich. Iconic vampire.
Lord Soth.
Xanathar. A beholder with a name and back story.
Accerack. Iconic lich. Tied to an iconic locale.
Lolth, Tiamat, and other evil deities of iconic races.
The demon lords, esp Orcus, Grazt and Demogorgon.
Who else? The 3e iconics (Tordek, Mialee, etc)? Mordenkainen, Bigby and other spell namers? Who else stands out among the (in)famous of D&D?