Am I Actually the Strongest? Manga Series by Ai Takahashi, Sai Sumimori, 澄守彩, 高橋愛

To be reincarnated into another world with the promise of a "cheat" power is one thing... but to be reborn as a baby, and then left for dead after your royal parents think you're powerless?? That's another thing entirely! Now the newly-born Reinhardt -- or Haruto to his new friends -- must find his way through a dangerous world... but luckily he's got magic that's quite literally off the charts!

I got thrown out of the family the moment I was reincarnated as a baby! But I'll survive with my overpowered magic! After saving his mother and sister from empire soldiers, Haruto's younger sister, Charlotte, grew attached to him. But that's not all... She mistook Haruto for a hero of justice!! Now, he plays along and calls himself the Black Knight as he ventures out to protect the frontier region. But to his surprise, he finds out the truth behind the mastermind who's targeting his family...!

To be reincarnated into another world with the promise of a "cheat" power is one thing... but to be reborn as a baby, and then left for dead after your royal parents think you're powerless?? That's another thing entirely! Now the newly-born Reinhardt -- or Haruto to his new friends -- must find his way through a dangerous world... but luckily he's got magic that's quite literally off the charts!

Liza the Blizzard Dragon has begun life with Haruto and his family after he saved her from a group of adventurers. The time has come for Haruto to choose a servant to bring with him and start his school life in the royal capital! How will this play out for our woeful hero?! What's worse, it seems like some vile conspiracy is budding far away from Haruto's eyes.... What awaits our brave Black Knight?! Here starts his life at the royal capital!

It took no time at all for a weird professor to get attached to Haruto just after he started school. But to make matters worse, when he accidentally insults a flashy upperclassman on the day of the entrance ceremonies, he gets dragged into disastrous trouble along with a girl who's a bit slow on the uptake. All Haruto and his copy wants is a peaceful, quiet school life, but what fate awaits them?!