I read the recent article on the idea of taking Avengers in Tamil and who would be the apt choices, posted by Thirumurugan Thiagu Satiawall. This is an awesome idea, albeit fictitious. Although I liked his choices, I am inspired to suggest choices of my own. This is even more fictitious and bigger than the previous said cast. So here goes: 

Nick Fury - Sathyaraj is the best possible. I agree too. 

Agent Coulson - Vivek. Again best choice Thiru! 

Iron Man - Vijay. My choice. Because he has the mass appeal similar to Ironman and his histrionics and mannerisms will bring in added gethu to the role too. Plus he is capable of stealing claps through his one liners.  

Hulk - Ajith. I think he is the best choice. If you think, Hulk was the show stealer in the movie. Ajith with his immense mass appeal can just be THE hulk. Imagine, "That's my secret, cap! I am always angry" and then he turns into the Hulk. Audience would go crazy. Also he can be calm n cool in the first half as the scientist to add up to the effect in the second half. 

Captain America - Vishal. He can be that naive and sincere guy who is out of time. Vishal with his tall n hunk look will easily carry off the cap role. Plus he has the attitude to give the commands to others in the climax fight. 

Loki - Dhanush. This guy's got a national award and almost equaled it in 3. He can be that villain who takes on all the others with his lean n mean figure. He would be perfect as the silent, jealous brother and could pull off with perfection the role of the subtlety deadly villain. 

Hawkeye - Arya. Hawkeye was cool and casual in the Avengers. I feel Arya would be apt for this role.  

Thor - Ram Charan Teja. This was the most difficult choice. I couldn’t think of anyone else in Tamil who could essay this role perfectly. So I thought after Magadheera, he would be apt. Anyways, Thor wasn’t that important in the movie. He was mocked by Ironman and Hulk. So I felt its ok. 

Black Widow - Tamannah. Tamannah's figure and facial structure suit ScarJo, I felt. Other than that I didn’t think much. Not necessary to think also, being the heroine role. 

Jarvis - Santhanam. Hehe, this idea is just to increase the coolness of the movie. Put Santhanam and make him have awesome exchanges with Vijay as ironman. Increase the comic element of Jarvis, the voice-only both computer of Ironman. Imagine Santhanam in the helm of affairs in the second half when it’s all serious. He can also control Ironman's ego/narcissism by constantly giving sarcastic retorts. 

Pepper Potts - Anushka. Just to increase the hotness quotient. hehe!! 

Technical aspects. I agree with Thiru. He has thought out a lot.