Two Studies: The dopamine beta-hydroxylase (DBH) gene may be in linkage with the ABO gene

Shoko Tsuchimine, Junji Saruwatari, Ayako Kaneda, Norio Yasui-Furukori (2015), ABO Blood Type and Personality Traits in Healthy Japanese Subjects
[http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0126983]

Donna K. Hobgood (2011), Personality traits of aggression-submissiveness and perfectionism associate with ABO blood groups through catecholamine activities.Medical Hypotheses, Volume 77, Issue 2, Pages 294-300.
[http://www.sciencedirect.com/science/article/pii/S0306987711002106]

A Grant-in-Aid for Scientific Research of Japan -- 200,000 samples in 30 years

In 2011, Mr. Masahiro Nagashima (National Nagasaki Univ.) had performed a supplementary examination of Mr. Sakamoto's paper mentioned above.
The number of samples was 30,000 people in 11 years in Mr. Sakamoto's papers, to my surprise, as many as 200,000 people in 30 years are investigated by Mr. Nagashima's Grant-in-Aid for Scientific Research in 2011.  However, the number of samples and years and were not specified in this report for some reason, so that  I have to suppose these numbers.  The followings are excerpts:

血液型と性格に関する解析では、過去の研究結果を拡張することができたとともに、21世紀以降のデータでは、安定して血液型ごとに性格の自己申告について有意な差が出ることが判明した。
We also demonstrate that significant difference on personal characteristics between blood-types by using the database on recent huge questionnaires survey.
科学研究費助成事業（科学研究費補助金）研究成果報告書
From the Database of Grants-in-Aid for Scientific Research
教員養成課程における科学リテラシー構築に向けた疑似科学の実証的批判的研究
FY2011 Final Research Report: A demonstrative and critical study on pseudo-science for scientific literacy construction at teacher education course
2010年度～2011年度
FY2010-2011
代表者 武藤 浩二 Principal Investigator MUTO, Cosy (National Nagasaki Univ.)
研究分担者 長島 雅裕 Co-Investigator MASAHIRO, Nagashima (National Nagasaki Univ.)
[https://kaken.nii.ac.jp/d/p/22650191/2011/8/ja.en.html]
[https://kaken.nii.ac.jp/pdf/2011/seika/C-19/17301/22650191seika.pdf]

Now, the statistical debate was already over!

TV animaition series "KETSUEKIGATA-KUN! 3" will begin soon in Japan

Korean-cartoon-origin TV animation series "KETSUEKIGATA-KUN! 3" will start on October 12, here in Japan.
The title: "KETSUEKIGATA-KUN!" in Japanese literally means "Blood Type Boy" in English.
The first season, "KETSUEKIGATA-KUN!" was on the air in 2013 and the second season, "KETSUEKIGATA-KUN! 2" was in 2015. As the predecessors, ten or more episodes is to be broadcast.
The following is the program's URL:
http://ketsuekigatakun.com (in Japanese)