Telemachus!

Telemachus, instead of attempting to evict his mother's suitors from his house, merely complains about their presence to the town. When he gets no results from this, he asks Zeus for help, and eventually is persuaded by Athena to look for his father. All of these things show us Telemachus is immature at the beginning of his journey; instead of directly dealing with his issues, he "tattles" on the suitors to the Ithacans, to Zeus, and to his father if he can find him. Telemachus shows that he is maturing slightly before his journey's beginning when he makes sure that his mother doesn't know he is gone until long after he is. This shows responsibility.