A youtuber named IhasCupquake, she got news that Salty is BAD news. Like all the others, stay away from him, and also he can summon sharks (every menfolk who has the 'Evil' trait can summon sharks) so WATCH out! (Don't be enemies with him, you know he can summon sharks)
Haha! My Martial Artist Sim eats sharks for breakfast.
OK, not literally, but she has never lost a fight to a shark, and I had a fantastic collection of shark teeth to show for it - some of the easiest money I've ever made.
Anyway, in terms of mermaids...how can I say this? They're pretty and everything, and cool to look at, but they are definitely
not my favourite occult lifeform.
Apart from the fact that their nutritional needs are never met (Y U No Make Kelp Recipes, EA?!), the thing that really annoys me is the default need to swim. Everywhere. Even when they're exhausted and their home is on the other side of the island.
And their swim-speed is only a little bit faster than a moving houseboat. (OK, not really, but it feels that way, when I'm trying to get to work. LOL)
As someone mentioned before (can't remember name, sorry!) the micro-management has really dampened my enthusiasm for this childhood fantasy.
In terms of mermaids as Lifeguards: yep, the job really suits! I'm a little more gung-ho with my Sims, so I don't sweat a little negative moodlet. My sim does her surveillance from the sand, and grabs some hydration every time she saves someone. (Which is not that far apart, time-wise.)
I've found that the best way to keep my merSim from dying of starvation is to do a couple of hours fishing every day, so she has a nice stash of fresh fish in her inventory - sashimi, anyone?. (By "fishing", obviously, I also mean catching fish whilst diving.) And harvest as much kelp as possible - buying from the grocery store can be way more time-consuming than it's worth. One cool feature of merSims is their ability to eat underwater - a definite plus, if you're trying to get that last blasted piece of map.
{EDIT}: Food morsels from WA work just as well for mersims as for regular sims.
Small side-note: For those of you who would prefer to prevent your merSims from turning human again, do not take a super-long vacation in China (can't remember if France and Egypt have salt water, so this might apply there too). My merSim was in China for 5 days, and already started to show the "Salt Water Deficiency" moodlet.