We can create Regional text ads in Google GDN campaign
I have doubt we can create regional Text ads in Google "Search and Display" campaigns.(i.e tamil,kannada, and Malayalam). Because I going to target this locations.
And If we can create text ads means tell how the Google calculate the character limits.
you can indeed put location names and regional data into your ads. The limits are the same as normal. Char limits can be found here: https://support.google.com/adwordspolicy/answer/6021630?hl=en
I think you can not create ads in Tamil, Kannada and Malayalam languages.
See the full list of languages that you can target by viewing the "Languages" section of your campaign settings in Adwords.