Any character is fair game for a beginner with a few exceptions.
Personally i don’t advise a beginner to use grappers as they require alot of solid fundamentals and they are pretty limited in how they use the SF mechanics and some of the metagame.
People play different against grapplers and you need to play different as a grappler. Excecution-wise they might seem easy but for everything else they require a ton of knowledge and experience and alot of patience. You won’t be able to transfer to other characters afterwards as easily. Lastly i advise against playing very unorthodox and excecution heavy characters, characters such as Gen, C.Viper and El Fuerte.
A question about which characters are most Fun and Creative, the answers you’ll get will be really subjective and all over the place. People like different playstyles and get their enjoyment in different ways.
Honestly you are asking all the wrong questions that are indicatie of a typical beginner, which is fine, however do not bother yourself to try and categorize these characters by other people their standards and just look at the things YOU enjoy in a character and go from there.
So what are YOU looking for in a character, once that is known people can start helping you.