This should be an interesting pair.
Her role would be substantial like the heroine who started in the original version. As far as Ahan Shetty goes, he does look like his father Suniel Shetty but ironically he resembles the lead actor in RX100 as well.
Ahan does seem to have a good voice as there were videos of him on YouTube like all these celebs who come out of the airport getting their pics clicked. He also has that rough look as well with his beard so I think this role will suit him. Milan is a good director who will make him stand out but his Ahan's job to connect with the audiences because it's his debut.