The Anime Lad
Ernesti Echevarria is reincarnated into another world while retaining his old fascination with mecha. The new setting contains Silhouette Knights, enormous humanoid weapons that are no longer confined to fiction. Ernesti promptly decides that observing them from a respectful distance would be inadequate. He intends to become a pilot.
Super Eyepatch Fox
A Japanese mecha enthusiast is reborn as Ernesti Echevarria in another world. His previous interests survive the transition. When he learns that Silhouette Knights, giant humanoid weapons, truly exist there, he gains an immediate objective. He wants access to a cockpit and a chance to pilot the machine he once could only imagine.
Gigguku
Ernesti carries his mecha obsession into a world where giant humanoid weapons are REAL. That is outrageous luck, and he recognizes it immediately. Silhouette Knights are no longer models or stories. They are standing in front of him, large enough to climb into. Of course he wants to pilot one. Any other response would waste the premise.
Father's Basement
Reincarnating a devoted fan into a world built around his favorite thing is direct wish fulfillment. The useful distinction is how specific that desire is. Ernesti is not vaguely chasing power or prestige. He has seen Silhouette Knights and wants to pilot one. The clear objective keeps the fantasy from becoming a shapeless collection of advantages.