I'll kick off the Herbig Ae/Be records. I have no idea if it's hottest/coldest or largest/smallest. Hopefully my first entries will get changed to the other category when the next entry comes along.
Largest Herbig Ae/Be protostar - HD 186978 D with 0.1225 solar radius - CMDR Zenith Ddraiglas
Heaviest Herbig Ae/Be protostar - HD 186978 D with 4.4844 solar masses - CMDR Zenith Ddraiglas
Hottest Herbig Ae/Be protostar - HD 186978 D with 3,663.00 K - CMDR Zenith Ddraiglas
Oldest Herbig Ae/Be protostar - HD 186978 D with 84 million years - CMDR Zenith Ddraiglas
Largest Herbig Ae/Be protostar - HD 186978 D with 0.1225 solar radius - CMDR Zenith Ddraiglas
Heaviest Herbig Ae/Be protostar - HD 186978 D with 4.4844 solar masses - CMDR Zenith Ddraiglas
Hottest Herbig Ae/Be protostar - HD 186978 D with 3,663.00 K - CMDR Zenith Ddraiglas
Oldest Herbig Ae/Be protostar - HD 186978 D with 84 million years - CMDR Zenith Ddraiglas