Luke and Jan Valentine's Merry Manga

Luke and Jan Valentine's Merry Manga (ルークとヤンのあとがきまんが,) is an omake of the Hellsing manga appearing not until Volume 2 of the manga.

It's a very short, fun afterword which stars the Valentine brothers, Luke and Jan. Appearing at the end of the volumes, every volume has Luke and Jan talking about different stuffs. It's also not in-universe, meaning that Luke and Jan are basically self inserts; they talk about things like Gundam characters, making fun of the pacing of Hirano himself, ect. Essentially, it's just Hirano having fun; as the drawing too are messy.

They are also Kouta Hirano's favorite characters, which would make sense as to why he would make an omake manga specifically for them.

Trivia

 * Volume 5 is the only time that Luke and Jan's names are switched around in the title of the Merry Manga.