Dude, I love love love this chapter so much!First of all, to answer your question, I think Anika and Rudra are definitely the ones who would be most scared of the supernatural because they're very similar in personality, glad I'm not the only one who thinks so. But it would be kind of funny to see Shivaay get all scared because I think he's secretly terrified of the supernatural, but that's just me. Om wouldn't get too scared, but he also just might. Saumya and Ishana I think I can guarantee that they are not afraid of the supernatural. Saumya would remain extremely unimpressed and criticize a ghost for not being ghostly enough, while Ishana would just stare into its soul until it screams in terror and runs away.
Second of all, I like that you mentioned with each pairing how they all affect each other, I liked that insight into their minds, although since you were getting everyone's opinions on their other halves, I would've loved to read about Saumya's thoughts on how Rudra affects her, it just makes more sense if you had done that.
Also, two things that I really liked that you mentioned were Ishana's dynamic with Shivaay and Rudra, which I myself look forward to seeing on the show and more in your fic, and that although Saumya by herself is literally the mom friend, but with Rudra around, she's basically a five year-old.
Can't wait for the next chapter!