I nominate @sofusmortensen. He is a DA alumnus who after moving on to new challenges kept on being one of our most passionate community members; he recently shared an interesting proof-of-concept on Business Process Modelling.
I also second the nomination of @cocreature, who’s consistently been the most engaged DA member with the community. His ideas always go towards making DAML a friendlier and more useful language for users. I’m extremely excited about the use cases enabled by DAML Script and DAML REPL and he has been the main driver behind both projects.