I loved how Sigma and Milla interacted in his network, so what do you think about having them meet some time in the Arena? Sigma is actually a psychic as well, but more of the prophetic sort - still, he has met very few adult human psychics that are friendly to him and it would give him great relief to know that he isn't alone, as he's been heavily burdened by his powers. He would be willing to offer her an alliance if she wanted it - perhaps they could scavenge or avoid aliens together? Just bouncing ideas around, let me know what you think!