What is X Reader?
X Reader is a term used in secondary creations known as “Yumehon” in Japan. It's a creative genre that depicts interactions between copyrighted characters from manga or games and original characters prepared by the reader (writer).
Depending on the writer, the relationship can vary, such as being depicted as a friendship with an original character or a work depicting a romantic relationship. By introducing original characters that do not originally appear in the work, it is a popular creative genre that can express personalities and behaviors that copyrighted characters do not usually show, without changing the relationship with other copyrighted characters in the same work.
※When introducing characters, it includes some spoilers up to what is currently being aired in the anime. Please be careful!
Karamatsu x Reader (Female)
Karamatsu is truly, his behavior is a bit ostentatious, but as the anime progresses through the second and third seasons, you'll see more and more of his sensible and kind-hearted side, which is one of his charms!
If asked who I'd like to be friends with among the sextuplets...... Personality-wise...... Well...... Karamatsu...... Yes...... Karamatsu...... If asked if I want to go so far as to be friends with him, I'm afraid I might get swayed around a lot, and he might ask me to lend him money! So the other five are a bit scary, but I think the somewhat timid and kind Karamatsu would be nice. (Sorry if that sounds condescending)
Ichimatsu x Reader (Female)
I think Ichimatsu is the most brother-like character among the six brothers! I think Todomatsu is definitely the most cunning, but he often needs care, tends to get depressed, and often relies on his older brothers and younger brothers, so I think he's somehow cute!
It's not uncommon for serious trouble to occur due to his negativity, but that's also what makes him cute. However, when asked if I want to be friends...... well...... um...... Let's move on to the next character introduction!
Osomatsu x Reader (Female)
Osomatsu is basically a really irresponsible good-for-nothing, but occasionally he shows his eldest son-like side, which is attractive. He often encourages others and takes the initiative to solve problems when his brothers are down in movies or special editions.
Osomatsu-san X Reader
But at the same time, I think he's a character who's more obsessed with the 'Sextuplets' than anyone else. He seems to want to stay the same and have fun with his six brothers, and he seems a little lonely when he sees his other brothers growing up. You might find life more enjoyable if you try to interact with him more! He's really nice to his beloved Totoko-Chan, and he might even be considerate......?