Beginner Character for OW?

I would say that Soldier 76 is the best beginner hero, as he isn't too aim intensive, but he still requires aim, ensuring that you will hone your skills while playing him. He can be played safely on a far back high ground, where he can use his constant and reliable damage from his pulse rifle to eliminate enemies, while offering high burst damage with his helix rockets. His E is very good, as it allows you be self sufficient and to take care of yourself, when often at lower ranks, you won't always have a reliable healer to bail you out -- and that is, if you even have a healer at all. :/ Plus, his sprint allows you to re position onto high grounds and evade enemies, and since it has no cool down, it's one less thing you have to worry about while in the heat of the battle. Finally, his ultimate is very good as it teaches you about when the best time to use your Q is. This is because you can get high value if say, their main tank is down, or if their dva was just de-meched, now you can go in and frag. While at the same time, it is an ult where you need to think about its usage, as very easily, you may just be shielded or defense-matrixed out of using your quad kill. Overall, Soldier is an owesome all-round hero which teaches you all that you need to know when newly hopping in to Overwatch. I could not recommend this hero more, and it gives you the groundwork to use as a jumping point to go to any other hero or role. Hope this helped.