Pikachu

Character Basics
Pikachu is an Electric type Pokémon, which was introduced in Generation I of the Pokemon series. Pikachu is renowned for being the most well-known and recognisable Pokémon. Over the years, Pikachu has become so popular that it serves as the Pokémon franchise mascot. It is the version mascot for the game Pokémon Yellow. It is also well known for the anime, where Ash Ketchum, the protagonist, owns a Pikachu.

In Super Smash Bros
Pikachu was introduced in the first Smash game as one of the starting 8 characters in the game, it has been in every Smash game since and is one of the most recognisable characters in the series.

In Super Smash: Bloxxed
Pikachu is one of the original ten characters, it'll be based on its Smash Ultimate incarnation. It is a Speedster so it has high attack and speed but it is fragile.