You can replace red chilli flakes with one green chilli, chopped thinly.
The batter should be really thick, otherwise the pakodas will drink a lot of oil.
I've seen my umma add a pinch of baking soda to give it a puffiness, you may add if you want, but I prefer not to.
You can even add some all-purpose flour in place of the besan for some crunchiness.
You can add in mint and coriander if you love its flavors - basically the variations are endless...