Unusual/Uncommon Isekai

Yogiri Takatou, Tomochika Dannoura, and the rest of their class find themselves summoned to another world during a field trip. The only problem being Takatou and Dannoura didn't get any special power from the Sage that summoned them.

Boy reincarnated as Creation Demon Lord Procell that rules over his own dungeon.

Takashi Koizumi dies and the only way for him to go to Heavon is to complete the dungeon. His class is summoner but he only seems to be able to summon cute chibi demons.

Mairimashita! Iruma-kun is the story of Suzuki Iruma, who has been sold to the demon by his irresponsible parents in exchange for money. Surprisingly, next thing he knows, he is living with the demon and has been transferred into a school from Demon World.

Crown prince Cecil was so brilliant that everything in life was easy to the point of boring him, then one day, his fiancée Bertia suddenly said "Prince Cecil, I am a villainess!" Claiming that this world is the same as that of an "otome game" from her past life and that she is playing the role of the "villainess" in it, she aims to play her part well and have their engagement annulled. With that goal in mind, she sets about causing turmoil in Cecil's daily life

Knight reborn as a S-rank monster

Man that died of overwork gets his wish of a relaxing life when he was reincarnated as a rich girl's pet.

Not exactly "unusual" but a Vet is summoned to another world.

William is the lone human in a city of the dead. Born with vague memories of a past life and raised by a group of undead, William must discover what circumstances brought him to this city and these people as well as what it means to not just exist, but to live a full life

A high school girl reincarnates in another world as Lily. While she occasionally reminisces about her past life, she is now a maid who spends her days traveling and working in various homes. One day, the court magician Leonard suddenly requests that she acts as a mother for his adopted daughter Jill.
(Also not exactly unusual but it's one of my favourites so i had to add it)