For my own reference, the list of sextuplet pairing names made up by Japanese fandom. Translated it so that if you’re interested in looking up more of your favorite pair, here’s your explanation for where the names came from. LOL.
Osomatsu + Karamatsu = 長兄松 (choukeimatsu = eldest brothers-matsu) [the two oldest brothers of the sextuplets]
Osomatsu + Choromatsu = 速度松 (sokudomatsu = speed-matsu) [“Osoi” (slow) and “Chorochoro” (quick)]
Osomatsu + Ichimatsu = パーカー松 (parkermatsu) [Is seen mostly wearing parkers in official artwork]
Osomatsu + Jyushimatsu = 馬鹿松 (bakamatsu = idiot-matsu) [Officially called “idiots” (baka) in their profiles on the anime homepage]
Osomatsu + Todomatsu = 紅松 (benimatsu = crimson-matsu) [Their official colors are of the red hue]
Karamatsu + Choromatsu = 水陸松 (suirikumatsu = land-and-water-matsu) [Their official colors are blue (water) and green (land)]
Karamatsu + Ichimatsu = 色松 (iromatsu = color-matsu) [When you write KaraIchi カラ一 it looks like the katakana “color”]
Karamatsu + Jyushimatsu = 筋肉松 (kinnikumatsu = muscle-matsu) [Karamatsu is known for being powerful in “Osomatsu-kun,” while Jyushimatsu has high physical ability in “Osomatsu-san”]
Karamatsu + Todomatsu = 材木松 (zaimokumatsu = wood-matsu) [Larch tree “karamatsu” and fir tree “todomatsu”]
Choromatsu + Ichimatsu = 年中松 (nenchuumatsu = middle-matsu) [The two middle brothers of the sextuplets]
Choromatsu + Jyushimatsu = 若葉松 (wakabamatsu = new-leaf-matsu) [Their official colors make up the “leaf mark” sticker given to newbie car drivers]
Choromatsu + Todomatsu = サイバー松 (cybermatsu = electronics-matsu) [They’re often seen with a smartphone or laptop in official anime videos]
Ichimatsu + Jyushimatsu = 数字松 (suujimatsu = numbers-matsu) [1 for “ichi” and 14 for “jyushi”]
Ichimatsu + Todomatsu = 110松 (ichitomatsu = 110matsu) [1 for “ichi,” 10 for “to”]
Jyushimatsu + Todomatsu = 末松 (suematsu = youngest-matsu) [the two youngest brothers of the sextuplets]
Edit: To make it even more confusing, these pairing names are not necessarily meant for romantic relationship. Japanese fandom has now more or less agreed to use the above names if it concerns a duo involved in non-romantic, brotherly action, while using their actual names to indicate a romantic relationship (ie, ichikara, osochoro).
Edit2: By popular demand, this post now includes the trio names. Many of the trio names start with 六つ子 (sextuplets) and end with 組 (group) to differentiate from other series who share the same name. Again, all of the names on this post are not coupling names.
Osomatsu + Karamatsu + Choromatsu = 兄松・六つ子兄組 (animatsu/ mutsugo anigumi = older brothers-matsu) [The three oldest brothers]
Ichimatsu + Jyushimatsu + Todomatsu = 弟松・六つ子弟組 (otoutomatsu/ mutsugo otoutogumi = younger brothers-matsu) [The three youngest brothers]
Osomatsu + Choromatsu + Jyushimatsu = 奇数松・六つ子奇数組 (kisuumatsu/ mutsugo kisuugumi = odd-numbered matsu) [The odd-numbered trio; 1, 3, and 5]
Karamatsu + Ichimatsu + Todomatsu = 偶数松・六つ子偶数組 (gusuumatsu/ mutsugo gusuugumi = even-numbered matsu) [The even-numbered trio; 2, 4, and 6]
Osomatsu + Ichimatsu + Todomatsu = 合格組・扶養合格組・六つ子合格組 (goukakugumi/ fuyou goukakugumi/ mutsugo goukakugumi = passing-trio) [The trio who passed the family interview for who gets to become a dependent]
Karamatsu + Choromatsu + Jyushimatsu = 保留組・扶養保留組・六つ子不合格組/素数松 (horyuugumi/ fuyou horyuugumi/ mutsugo fugoukakugumi/ sosuumatsu = reserve-trio, primary numbers-matsu) [The trio who did not pass the family interview for who gets to become a dependent. Also coincidentally, the primary numbers trio]
Osomatsu + Karamatsu + Ichimatsu = 事変組・グラデ松 (jihengumi/ guradematsu = incident trio, gradation-matsu) [The trio who were part of the “Ichimatsu Incident’ skit. Initially they were called ‘gradation-matsu’ because their official colors made a gradation, but the name ‘jihengumi’ for them has become more popular]
Choromatsu + Jyushimatsu + Todomatsu = 事変欠席組 (jihen kessekigumi = absent for incident trio) [The trio who were not part of the “Ichimatsu Incident” skit]
Osomatsu + Karamatsu + Todomatsu = 釣り松 (tsurimatsu = fishing-matsu) [The three who have been seen fishing together]
Karamatsu + Ichimatsu + Jyushimatsu = 六つ子問題児組 (mutsugo mondaijigumi) [The trio that acts like a problem; Painful, Tries to shit on a coffee table in public, and Jyushimatsu]
Osomatsu + Choromatsu + Todomatsu = 六つ子マトモ組 (mutsugo matomogumi) [The trio that acts relatively decently, based on rational thinking, and have been shown to be tsukkomi a few times]
Osomatsu + Karamatsu + Jyushimatsu = 六つ子原色組 (mutsugo genshokugumi) [The trio of primary colors; red, blue, and yellow]
Choromatsu + Ichimatsu + Todomatsu = 六つ子混色組 (mutsugo konshokugumi) [The trio of compounded colors; green, purple, and pink]
Osomatsu + Jyushimatsu + Todomatsu = 六つ子暖色組 (mutsugo danshokugumi) [The trio of warm colors; red, yellow, and pink]
Karamatsu + Choromatsu + Ichimatsu = 六つ子寒色組 (mutsugo kanshokugumi) [The trio of cold colors; blue, green, and purple]
Osomatsu + Ichimatsu + Jyushimatsu = 非カタカナ松 (hikatakanamatsu) [The trio that does not have katakana as part of their names]
Karamatsu + Choromatsu + Todomatsu = カタカナ松 (katakanamatsu) [The trio that has katakana as part of their names]
Choromatsu + Ichimatsu + Jyushimatsu = ピタゴラ松 (pitagoramatsu = pythagoras-matsu) [The trio based on the 3:4:5 triangle definition of the pythagorean theorem)
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