Figaro the dog is appealing in cartoons because of his charming personality. He's often brave and kind, which makes us root for him. Also, his cute looks and playful antics draw us in.
I don't think it's based on a true story. It seems to be a creation of the writer's imagination. Maybe it takes some elements from real life but not a direct retelling of actual events.
A prevalent theme can be the exploration of different cultures or settings. For example, if Edgar Figaro is crossed with a story set in a historical period, they have to adapt to that new environment. Also, power - dynamics can be a theme. If they cross with a more powerful character or group, they have to figure out their place in that hierarchy.
A Pho Love Story is about the charming and heartwarming journey of two characters who find love through unexpected circumstances. It has elements of romance, culture, and personal growth.
A pho love story might center around a couple whose dates always revolve around pho restaurants, and through these experiences, their love deepens. Or it could be a story of how making pho together helps strengthen their bond.