Despair Event Horizon: Having his lover Cheza die in his arms made him lose all hope of paradise. Not only that, he is also assumed to be the last living thing in the world before he dies alone.
Last of His Kind: Kiba becomes the sole surviving wolf (and living thing on Earth in general) in the series finale. He eventually dies as paradise begins to be created from Cheza's seeds.
Hollywood Pudgy: Played with. In his human form, the only thing that is noticeable is his slightly chubby (as well as him wearing baggier clothes). His weight is more noticeable in his wolf form, however.
Dulcinea Effect: Before she even has a single line, Kiba vows to protect her and bring her with them. This is justified, because wolves and the Flower Maiden has an instinctual connection anyway.