@RainDash He got info, on the Vongolas. He wants to destroy the next heirs, before taking out the rest of the Vongola trash. My character going forward really depends on the characters around. However, for one way or another, he will (obviously), join the Vongola. Whether it be to destroy from within, or he finds certain characters interesting. From then on it's still going to be an unsteady alliance.
Genso's development will be simmering down of his wrath, finding a meaning to his life (aka friends, family, and perhaps lover). He will never be unselfish, but if all goes well, he will fight alongside the Vongolas for a long time.
If Genso cannot find meaning well, then he will go on to try and kill the Vongola from within, and proceed to annihilate the world. Perhaps he will try to use the Vongola to destroy most of the world and then throw them away.
It's totally up to the players how Genso will develop.