According to this site (in Japanese),
Santa Claus is not only one but all over the world.
Blood type is different for each person!
Japanese Santa is Type A.
A statistically significant difference in the distribution of ABO blood groups between the cohorts of centenarians and donors was found (Pearson Chi-square test [3 d. o.f] = 10.71, p = 0.007). The significance was mainly due to a higher prevalence of O blood type in centenarians compared with controls (56.4 % vs 43.5 %, Pearson Chisquare test [1 d. o.f] = 10.78, p = 0.0010)
The ABO blood group status was also found to be independently associated with running time, with O blood type athletes performing better than those with non-O blood groups. Overall, age, weekly training and O blood group type explained 62.2% of the total variance of running performance (age, 41.6%; training regimen, 10.5%; ABO blood group, 10.1%).
The results of our study show that recreational athletes with O blood group have better endurance performance compared to those with non-O blood group types. This finding may provide additional support to the putative evolutionary advantages of carrying the O blood group.
Completed surveys were collected from 182 volunteers  (97 male, 85 female), and participants formed a fair representation of blood types in the U.S. -- 56.0% type O, 30.2% type A, 10.4% type B, and 3.8% type AB.  Results of our analysis (MANOVA or Multivariate Analysis Of Variance)  showed no overall relationship between the five broad personality characteristics and blood type. 
Therefore, these findings support the contention that blood type is NOT related to personality.
29 The number of participants we used provided us with enough power to detect the expected effect (moderate effect size), based on an A PRIORI power analysis.
30 The typical frequency of blood types in the U.S. can be found in multiple sources. We referred to http://bloodcenter.stanford.edu/about_blood/blood_types.html
(Now moved to https://bloodcenter.stanford.edu/learn/blood-types/)
31 The results of MANOVA were F(15,522)=1.48, p=.11
32 We referred to Box's Test of equality of covariances between the sizes of relationships among personality factors based on blood type.
This claim is widespread and largely accepted in certain parts of the globe, namely Japan. This belief is also being (re)introduced in the U.S. more recently through popular books and claims such as those outlined in The Answer is in Your Blood Type.
As the image of psychology in here in Japan, "nonscientific", "humanities" and "friendly" factors were promine...