Can Tentacle Monsters Also Be Adventurers?

He traveled through time and became a tentacle monster. He originally wanted to lurk among humans and quietly expand his tribe. However, he was regarded as a "rare psychic assistance genius" because of his exposed abilities. Later, after my true identity was revealed by the reclusive sage and a death ban was planted, I could only become a messenger, taking the obsessed law enforcement girl on a journey of delivering messages. When the tentacle monsters began to come into contact with the adventurers, they discovered that humans were not easy to deal with. (The male protagonist has no green + harem)