I can only sugest shigurui.

You see, its not an fan service anime or fancy show. Its dark. Its brutal. Its confusing. Its cold to your soul. Straight gangster samurai story.

Once you get the story, it's just brilliant. The sound effects are perfect too. It's just perfect in everyway.

Try it. Its just a few episodes.

I have see one punch man and One piece and thought both of them was good but it depended on what kind you like  

Vivy, although it's a sci-fi about a songstress AI named Diva trying to prevent a clash between humans and AIs, it's neither a mecha or a musical. The best short description I can give without spoilers is kinda meme but really accurate: Terminator Hatsune Miku. Give it 2 episodes.

there are many good anime out there, I would go for eat your spleen or your lie in april, I really like them too much, also you have the rocord of ragnarok is kinda fun.

I am sure someone else has already mentioned this and it goes without saying, Attack on Titan, is probably the anime to have ever existed. 

I remember as a kid I was a fan of Yu-Gi-Oh too, even collected the cards!