Dear Ramaswamy,
Welcome to NT's thread. I have seen your posts in POW section and song picturisation thread. We have discussed about comedy roles played by NT. I remember tacinema asking me about the same and what are all movies you had mentioned were discussed but of course not very much in detail. You can find the same in earlier pages.
NT as villain, yes as you mentioned quite a few were there. Other than Andha Naal, Thirumbi Paar, Tuli visham(KR Ramasamy as hero, I have heard NT did a great job, though I have not seen it myself) and Rangoon Radha, there was Pennin Perumai and you can also include Vikraman character of Uthama Puthiran in this category.
Prabhu Ram,
Ele my friend is a English movie which was directed by NT's younger brother VC Shanmugam's son Murali. His full name is Muralidharan and he and his elder brother Giri (married to a US girl (Linda?) are settled in US. Murali married into NT's close friend's family in Vettaikaranpudhur near Pollachi, changed his name as Dharan Mandrayar (just like Rathinam Subramanian became Manirathinam) and did this movie. It was shown in festivals. About it's theatrical release, I don't think it got released in India. He (Dharan) also recently completed a feature film about the plight of young widows of Varanasi, who are affected by child marriage and the name of the film is something like "White -- " ( I am not sure). Read a good opinion/preview in TOI/ET.
Ramesh,
Your post also takes me to my school days.
Regards