....why is suchan (dragonfly) special again?? did they mention it? i forgot(´ڡ`)

hes just consume gigantia, and mc plot armor too much, nothing more

It's because no matter what is thrown his way, he overcomes it and grows stronger with each hurdle. He became stronger than his natural predator and killed it. He's just one of them "I get more OP with each battle" type of characters.

If bc he communicated with the monster’s within him and managed to combine both strength