Attack on Titan is great, Hunters is solid. For recommendations. They get hate from some die hards. But the classic 25 episdode(ish) animes, are some of the best and easiest to get into. Cowboy Bebop, Samurai Champloo, Trigun, Parasyte, and Steins;Gate are all ones that I've watched and re-watched
It's about an amnesiac - Seven - who needs money, so his friend makes him become an assassin. Seven's weapon are scissors he controls with magic. Despite the premise, the 1st season is pretty lighthearted (though there's one S1 episode that was unexpectedly dark). The show's main strengths are characters and plot. There are a whole bunch of side characters, which are still relevant in the newest season, even though it's plot-heavy. Season 4 is going to be released on the 21st this month!
Warnings: murder (duh), suicidal tendencies, mentions of cancer.
Great Pretender
This one's about the (self-proclaimed) greatest swindler of Japan - Makoto Edamura - who gets out-scammed by Laurent Thierry, who's probably the best in the entire world. They end up scamming criminals together.
It has really good animation and a unique art style. There was a lot of thought and effort put into the different languages spoken (in the Japanese version at least) - for example, Laurent's VA for speaking English has a French accent, and the characters who are supposed to speak Mandarin actually speak Mandarin.