Ash's Pikachu

This Pikachu is an Electric-type Pokémon owned by Ash. He is Ash's first Pokémon. Also, Pikachu always stays outside his Poké Ball, and can be seen riding on Ash's head or shoulder.

Personality
Pikachu is a strong Pokémon and one of Ash's most dependable partners. Whenever Ash isn't around, Pikachu takes a leadership position for the team. He is curious, smart, friendly, and shares Ash's fondness for battling. Pikachu is a very determined Pokémon and unwilling to give up in tough situations. He is responsible and often looks after younger Pokémon, particularly Misty's Togepi, who he is often forced to shepherd out of danger. Although stubborn at times, he obeys Ash's commands in battle and rarely leaves his side. Pikachu is also a target for Team Rocket. They try to capture him, but on the few times that they do, their plans are always thwarted by Ash and his friends. Pikachu will often use his Electric-type attacks to escape danger or traps, with Thunderbolt being one of his most common moves. He is very swift in battles as well. He can also imitate some Pokémon by making their face shapes.

Pikachu doesn't like being in his Poké Ball one bit, and also hates someone pulling his tail. He likes riding on Ash's shoulder.

In some episodes, Pikachu has a strong rivalry with other trainers' Raichu which is Pikachu's evolved form, with the exception of both Volkner and Tierno's Raichu. In the Sun and Moon series, during the pancake race, Pikachu wanted to defeat an Alolan Raichu. The prime example of this rivalry is when Lt. Surge's Raichu defeats and injures Pikachu in the first season of the anime. This also carries to Sho's Raichu who also overpowers all of Pikachu's abilities such as his Iron Tail and Volt Tackle. In these battles, Ash and Pikachu usually have to use unconventional strategies to win.

Even in the face of losses to Raichu, Pikachu refuses to evolve. This trait is later shared by his best friend, Dawn's Piplup, who also given the chance to evolve, but also refuses and is given an Everstone to prevent it.

(Im going to do the rest later)