Do you plan on using a sump/skimmer/fuge? Is the tank fish only with live rock or a mixed reef? There are many great beginner fish that have a lot of personality and color. Here are a few I've owned that I really love:
1. Any clownfish sans maroon (They are aggressive) I prefer ocelllaris clownfish and I've always bought a small pair because they tend to bond.
2. Flame Hawkfish: Beautiful coloration and hardy but can be a little pricey.
3. Royal Gramma: Another beautiful fish that has a tendency to hide. Best kept with active fish that may coax it out of hiding.
4. Firefish: Unique look and coloration. Very very good jumpers.
5. Starry Blenny: One of my favorite personalities in any fish I owned. I nicknamed mine "king grumpy cat" because he perched himself at the very top middle and would look down at all the other fish. He also looked like grumpy cat. Coloration is brown and white but man do they have a beautiful pattern.
6. Wrasses: There are many different wrasses to choose from. Some will grow too big for your aquarium, some are aggressive, some are extremely expensive, and some aren't reef safe. I've never seen one that didn't have personality, color, and activity however.
Fish that are easy but I would shy away from:
1. Cardinalfish: Hardy, small, and unique coloration but they just don't do anything but sit there. Had them and never really liked them.
2. Dottybacks: They can be really aggressive although they are beautiful and readily available I would shy away.
3. Anything that is not recommended for your tank size. (Tangs, rabbits, angels, triggers).
4. Damsels: Kill each other and fin nippers. I hate that there sold as peaceful aquarium fish at pet stores.
5. Chromis: Tend to see them in groups but in my experience you usually end up with a lot of dead chromis and one or two that are left.
I find temperament and prey drive to be a bigger issue in saltwater than when I kept freshwater. A lot of saltwater fish have little quirks (Jumpers, snail/CUC eaters, aggressive towards similar or different fish, fin nippers)If its your first aquarium I would stick to fish that are known to be peaceful to both other fish and corals or you will find that your stuck with a very specific setup.