Bomb

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Bomb
First game:	The Legend of Zelda
Smash Bros. info
First game:	Super Smash Bros.
Character:	Link, Young Link, Toon Link Samus Aran

You could be referring to the Final Fantasy series summon of the same name.

A Bomb is an item found in multiple different video games, most notably in The Legend of Zelda series. In the Super Smash Bros. series, Link, Young Link, and Samus Aran would be able to use bombs against their opponents.

In the Super Smash Bros. series, Link (from all three games), Young Link (Melee), and Toon Link (Brawl), were capable of launching bombs at their opponents by pressing down B. If they held the bomb for too long, then it'd explode in their hands, thus delivering damage. The only way that either of these characters could perform a reverse Hyrule jump, however, was by holding the bomb so that it'd launch him upwards.

Samus also had Bomb as her down special move, and would be performed once she went into her Morph Ball mode. Interestingly, she would also need to use this move in order to perform a reverse Hyrule jump.