I didn't like kartik's GF. She was wearing way too much makeup. I think he would look better with akku personally. I felt bad for akku, neha and aman today. neha loves aman, akku sees the bond that aman and neha share and feels bad, aman likes being with neha. But I think aman neha and kartik and akku would be ideal couples.
IMO its too early to say. We haven't been shown much of Akku & Karthik. Too early to make a judgement of their personalities as well as their compatibility together.
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It is early but I m going by the fact he is open and fun so he will draw her out of her shell like neha draws aman out of his. Plus he is good looking so is akku they would look nice standing together.