Reincarnated into a child - male protagonists

The ml reincarnates into a game/book character who’s so weak they faint over just walking.

There’s a semi love triangle with two princes and him so bl

Ml reincarnates into the child of a dragon.

He learns he’s basically op and possesses all elements

Famous warrior dies in war and reincarnates into the body of a beggar only to find out his sect is on the brink of extinction. What happened after he won the war??
-sects
-rags to riches fr
-martial master
-bros a gremlin mc

The mc specializes in mele magic which is looked down on

But he’s like the only guy who’s really strong using it.