What I'm looking for is, on the surface, a type-4 love triangle: guys A and C are both in love with girl B, and B is in love with C. However, what I'm looking for has a few differences. Of the two guys, one (the main character) is below average at best; he's weak, clumsy, short, has no self confidence, etc. The other has everything the first guy lacks; he's strong, tall, handsome, athletic, confident... The main character isn't in a relationship with B, has no hope to be in one, and knows all too well that she and the other guy are perfect for each other. However, whether he knows or not, he's the one in position C. And A has to deal with the fact that for all the things he has that C doesn't have, none of that matters since C is the one with B's heart.
I don't mind if B winds up turning and falling for A, so long as there's a girl D somewhere to take her place as the ultimate heroine. I'd prefer one where B finally manages to get her feelings through and makes things work, or a continuing story that has a strong indication of this.
As with most of my requests, I don't significantly care whether it's anime or manga, licensed or unlicensed, or whether it's made for kids or restricted to adults.
Spoiler for two examples:
As with most of my requests, I don't significantly care whether it's anime or manga, licensed or unlicensed, or whether it's made for kids or restricted to adults.