I'll name a few TRFers (past and present) that I always admired based on their build skills and willingness to share knowledge with others.
1. HCMBanjo - Chris Michielssen and his blog posts at
https://oddlrockets.blogspot.com/ have given me more information than any other source. He's also posted amazing content on these forums, answered numerous questions here, in PMs and emails, and was also willing to meet me on a trip to Orlando a few years ago. I had the pleasure to sit and talk to him for a while and he's just as nice in person as you could ever hope someone to be.
2. NJRick - A master builder himself, so many of his rockets have an amazing amount of detail added which makes them even more impressive. He inspired me to go beyond the regular instructions and add details that make the models look even better, and that improved building for me. He also is a very complimentary person and always has something nice to say in his posts.
3. Luke Strawwalker - Jeff isn't on TRF anymore due to differences with the "new" owners, which is a shame because every post of his was an encyclopedia of good information about rockets. I mean if you ask him a question about gluing a fairing on a Saturn V, he'd tell you a great way that he did it, then he'd keep writing to tell you all about the fairing on the real rocket, the engine, the history, and often would exceed the maximum post length and have to continue on a second post. All of it gold. I miss his knowledge base. He may or may not still be active on YORF but I realized long ago that I don't want to be.
There are others, but those are the top 3 for me.