Mr. Nello studies plants, calls himself the "representative of the Green Project" and has a plan to get plants to grow in the Barrens . Dart and his party stay with him the first night in Fletz where King Albert stays up all night discussing his plan with him.
Later he mentions that he feels as if someone is watching him. We discover that Princess Lisa has turned her telescope down from the stars and has been gazing at him and sighing.
Eventually he manages to get plants to grow in the soil from the Barrens.
At the end of the game, Princess Lisa and King Zior come to congratulate him on his success and he shakes her hand enthusiastically then bows to King Zior in appology while Lisa giggles. (One can infer it's possible he may become the Prince Consort to Lisa when she eventually becomes queen of Tiberoa, since her sister Emille married King Albert.)