Knights & Magic - MangaDex

A mecha otaku is reincarnated into another world as Ernesti "Eru" Echevalier. In this magical world, the country is protected by knights who pilot a kind of large humanoid weapon known as the Silhouette Knights. Dreaming of piloting these robots, Eru and his childhood friends, Archid and Adeltrud Olter, study Magic and work toward their goal together.

1001 Knights - MangaDex

Maseki Gurume: Mamono no Chikara wo Tabeta Ore wa Saikyou! - MangaDex

The Seven Deadly Sins: Four Knights of the Apocalypse - MangaDex

Wuming Qishi - MangaDex

Knight's And Magic

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Furuki Okite no Mahou Kishi - MangaDex

Knights & Magic - MangaDex

Sakyubasu ♀ ni Kyousei Tenshoku Saserareta Ore ♂ - MangaDex

Knight's And Magic

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Read Knights & Magic Chapter 63: Captured Princess - Mangadex