Louis Yodewara (also known as Yohdel) was first introduced in the Duel Masters Victory season of the Duel Masters anime.
Yohdel and Bucchake are old friends. After Katta Kirifuda got transferred to their school and they found out that he is Shobu's younger brother they thought that he will become a great duelist as well, instead he just liked curry bread and despises his brother and the Duel Masters card game. Due to his friendly character they became friends and thought him how to duel. They also introduced him to their old friend Benchan who could help Katta build decks.

(Source: Duel Masters Wiki)

The 10th Duel Masters series. 
 
The most anticipated card game, Duel Masters had returned after 2 years since the battle in the past season. However, Katta Kirifuda once the strongest duelist, is now a year 2 middle school student and had lost his passion of dueling throughout the 2 years, and dreams of curry bread every day. 
 
However, after an encounter with the baseball ace, Hokaben, a mysterious duelist and a reunion with his childhood friend Lulu Takigawa, he rekindled his dueling spirit and return to his journey of becoming the strongest duelist. With new friends and rivals and Katta's passionate duelist soul, the greatest battle begins!

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This sequel of 'Duel Masters Versus Revolution' continues the chain of events after the battle between the Invaders and Revolutionary. It's also the last season and conclusion of the Versus saga in the anime. 
The 'V' mark that was once on Katta Kirifuda's forehead hides a mysterious force. However, the power was sealed off.
 
Even though the impact of removing the seal does not do much, but Hamukatsu starts to talk! Plus more hamsters that are like Hamukatsu starts to appear!
 
They were then told about a secret organization, the "Rare Killers", with the members being transfer students of the school! What is the mystery of the hamsters like Hamukatsu and who exactly are the Rare Killers? 
The final battle is about to start!

The 8th Duel Masters series. 
 
This series continues the adventures of Katsuta Kirifuda, Bucyake and Yohdel throughout the school season. They meet new classmates such as Leo to duel against.

Duel Masters Victory is the 7th season of the Duel Masters anime series.
It introduces a new protagonist named Katta Kirifuda, the brother of Shobu. He wants to be a dueling champion like his brother Shobu, but in his own way. The series shows the beginning of his dueling adventures with his friends, Bucchake, Yohdel and Benchan. During these adventures he considers Dragon Ryu a fierce duelist as his rival.
This series also features the story behind the battle between the races of Hunters and Aliens.

(Source: Duel Masters Wiki)

The 9th Duel Masters series. 
 
In this series the story continues after Katsuta defeats the YA.RA.SI band and also gains back his popularity by defeating Leo and his sidekick Nai Minamimo.

In this series Katsuta will use a new race of Outrage creatures against the opposing new race of Oracle deck users. Also in the creature world a new time era will start off.