Dragon's Dogma may or may not count. It has a 'grab' function allowing you to hold onto enemies and climb them, but it remains to be seen how big the enemies are. The developers said they didn't like games where you fight a giant by hacking at his ankles, so it might happen and gameplay footage has shown an enemy a few times larger than the player character get jumped on, which suggests this trope may come into effect.
Dragon's Dogma may or may not count. It has a 'grab' function allowing you to hold onto enemies and climb them, but it remains to be seen how big the enemies are. The developers said they didn't like games where you fight a giant by hacking at his ankles, so it might happen and gameplay footage has shown an enemy a few times larger than the player character get jumped on, which suggests this trope may come into effect.