Knight's & Magic's premise is on Ernesti Echevarria voiced by Rie Takahashi in which he was an otaku obsessed with robots and was reincarnated as Ernesti but the backstory of him is glossed over instead bringing world building to it's forefront of the fantasy world that Ernesti now lives in. If anything Knight's & Magic is more fantasy mecha show than isekai.
Semantics out of the way...so how did Knight's & Magic fare?.
Knight's & Magic has the formula of Ernesti going up in the world with his love of robots and mecha-creation driving him, but not for glory or money or power, but so that he can continue to make mecha's and make better ones that aims for his aesthetics. Now Ernesti as a character is a pure wish-fulfillment character especially for mecha fans, however he does face some resistance in the form of other nations' engineers and even Ernesti's own nation engineers wanting to one up him and in the other nation's engineers case to fight him and finally destroy him. The resistance he faces are similar to Ernesti himself just with differing ideals when it comes to mecha-creations and it's THAT reason that Ernesti wants the maligned mecha creations to be wiped out from history as Ernesti wants his own designs to shine in the world.....yeah go for the monopoly Ernesti.
In terms of characters, well they get the bare minimum development or screentime as the narrative is ENTIRELY focused on Ernesti's endeavors of mecha-creation. The one thing LA finds funny is that Ernesti's denseness to romance is justified because of his love of mecha's is everything to him even when he has Adeltrud Olter voiced by Ayaka Ohashi glopping him any chance she gets and is in love with him. Besides Archid Olter voiced by Shinsuke Sugawara, Ernesti's childhood friend who gets a love interest in the form of a princess who gets a bit of screentime and Dietrich Cunitz voiced by Kazuyuki Okitsu who was once a cowardly Knight but changed his tune after an incident with Ernesti and some monsters, the rest of the characters are personalities and not much else really. It's the villains who are the more interesting characters in the anime, mainly Horacio Cojal voiced by Yuuichi Nakamura who believes in if mecha's can merely work it's functional, but his mecha designs are "exotic" to say the least that might piss Ernesti off because he's more about aesthetics.
On speaking of Ernesti's endeavors of mecha-creation, the world building is plentiful in this anime at the very least in the form of how mecha's are created. The anime does go into geo-political problems in the form of invasion of countries, rebels and royalty in danger but that is more or less a setting for Ernesti's gang than anything.
In terms of animation by 8bit, the character designs are exotic and fantasy Grecian-esque (LA is only guessing) costume designs. Ohh and elephant in the room but LA can't be the only one to think that Ernesti was a girl when LA first saw his character design and his androgynous look both costume and character-wise wasn't helping much. Mecha-designs wise, LA did like it for the majority of it and how Ernesti keeps upgrading and making them even flashier. The fighting is pretty decent though it goes through beam spamming and somewhat repetitive mecha sword-play battles were a detriment to the fighting animation.
As for voice acting, yeah does LA need to bring up Rie Takahashi crossdressing voices as the main lead, LA doesn't mind Rie's voice acting as she did a pretty good job (and is something of her forte for odd roles for her to do). Aside from the vast voice cast from Yukari Tamura, Shizuka Ito, Ayaka Ohashi, Sayaka Senbongi and Sayaka Ohara...they were greatly underutilized as yeah...Ernesti taking over the entire narrative from the start and everything.
Knight's & Magic is your run of the mill fantasy mecha "isekai" anime, it's not great beyond any stretch but it's not absolutely terrible either as it DOES give Ernesti obstacles he needs to overcome, good world building in the form of mecha-creation and the mecha fights are ok enough to watch. Not great, not terrible but run of the mill and "run of the mill" is the best way LA can see Knight's & Magic.
