My favorite game would have to be: Momento Vivere.
Among the dozens of RMXP games that I have played, only one game truly stands out as a game that not only provides a satisfying RPG experience, but also matches or exceeds the quality of many commercial RPGs. This game is Memento Vivere.
After a brief introduction enhanced by nifty graphical effects, the player gets right into the action. You control a female knight named Spade who must escort a boy named Sine to another city. Under this premise lies conspiracies and political ramifications. The world is fully fleshed out, with a complex religion, towns with unique architectures (you won't find towns using the same tilesets), and NPCs that don't act like lifeless robots. The dialogue is extremely well done and flows naturally. There is nary a line of stilted wooden dialogue in sight. I would even go far as to say that the dialogue is poetic and seamless. Enhancing the story are custom tileset edits that make you feel like you're playing a commercial RPG and not just another RMXP game.
Memento Vivere is not just an intriguing interactive story. Encapsulating the experience are some well thought out gameplay systems, ranging from the fully functional Chrono Trigger custom menu to the ingenious custom battle system developed by Ccoa. Monster encounters are perfectly balanced and dungeons are designed with enough craft and complexity to not be boring cakewalks or frustrating mazes.
Another plus about Memento Vivere is its use of gameplay elements that have not been seen elsewhere. The world map system in particular, while reminiscent of certain simulation RPGs, has not been used in a standard RPG before. And the elements that are borrowed from other games (such as the weapon skills) are used skillfully and in a way that seems like an homage than a ripoff.
Any flaws or glitches in the game (such as passability errors) are so insignificant that they do not deserve any mention. Overall, Memento Vivere is a game that everyone must play. It serves to inspire and show fledgling game makers that yes, with enough patience and dedication, you too can create a game of 32-bit commercial RPG quality.