Toppaneko

Toppaneko is the het ship between Toppa Bashin and Meganeko from the Battle Spirits Shounen Toppa Bashin fandom.

Canon
Meganeko lives close to Bashin, and they both are childhood friends. Meganeko has always had a crush on Bashin. She often spent time with him, despite not being interested in Battle Spirits. Even though she sometimes found him difficult, she still planned to one day be his bride.

As Bashin started to grow closer to his friends J, Striker and Suiren, he would spend less time with Meganeko. This led to her feeling neglected, especially when she heard that they all went to see My Sunshine together. That day, she visited Card Sensei, who was sick. She confessed to him how she was feeling.

At the spring tournament, she entered under the name Kiiroko, disguised in a yellow version of Suiren's outfit. She was able to go to the main tournament, where she lost to Bashin, but was still able to reach him. Bashin was the only one to recognize her under the costume. The next day, Meganeko reveals her stone to Bashin, and has another surprise; she got contacts. Seeing her without glasses, Bashin blushed. She was soon accepted by Bashin's card battler friends.

Meganeko, now with a power of her own, tries to support Bashin, especially when she realizes how upset he was after J joined the Thousand Spirits Group. She entered a tournament on Bashin's team, Team Shomen Toppa, to help get J.

Moments

 * Toppa Bashin defending Meganeko in the 3rd episode.
 * Toppa Bashin inviting her to a My Sunshine show in the 4th episode.
 * Meganeko giving him a bentō in the 5th episode.
 * When Meganeko got contacts, Bashin blushed to see her without glasses.

Fanon
Toppaneko is the main relationship in Shounen Toppa Bashin, what makes it the most popular ship in this anime. Because Meganeko is a sympathy girl in love with the protagonist makes the fandom wait for the two to be together. Sometimes, like the aforementioned blushing, Bashin also shows having a crush on Megameko. Due to the lack of popularity of the show, there are also not many fanfics on the internet, with only one registered on AO3 so far.