#(I'm skipping the next two known birthdays (Sophie and Susannah) because I doubt I could put together posts for them sorry^^')

[kuroshitsuji-wiki]

Vincent Phantomhive's birthday (June 13, 1851)

It is Vincent's birthday today!

Give him congratulations - even if he doesn't comb his hair as he should! (Have some mercy on your older brother, Francis...^^')

Time for some trivia!

Vincent was born on a Friday the 13th in 1851, and his mother Cloudia died on one in 1866 (July 13)!

Yana always keeps in mind to draw him differently depending on the person who is recollecting him:

"[...] Speaking of daddies, Ciel's daddy made a little appearance in the latest volume [*vol. 9]. I always keep in mind to draw him differently depending on the person who is recollecting him (I try to but I'm not sure if I managed it), like this: Madam Red -> a gentle man who she wants to forget Ciel -> a gentle father Kelvin ->  kind looking yet evil man Tanaka -> Earl Phantomhive, the 'evil nobleman'" (Archived blog post/Translation)

In the same post, Yana briefly ponders over Tanaka's influence on Vincent as,

"There's that old saying 'One's foster parents have more influence on the child than one's real parents.': Ciel became an extreme sadist due to Sebastian's education in the last three years and it seems like the evil blood in him [*the evil side of his personality] was completely awakened [by Sebastian]. But if we consider the possibility that Vincent might have been brought up by Tanaka-san, that old guy must be quite...... oh I'd rather stop here." (Archived blog post/Translation)

Yana once tweeted that "because his wife was young, *papa [*Vincent] would [try to] make himself look younger." (Translation) However, Angelina's anime character sheet states her to be "32-34" in 1888, placing her birth sometime between 1854 and 1856. As Rachel is her older sister, Rachel's last possible birth year is 1855 which means that she could, at most, be four years younger than Vincent.

In the official character guide, Vincent is described as a "doting father" who must have loved Ciel very much. (Character Guide, page 121)

From his character guide sketch, it seems as if Yana considered giving Vincent long hair which he would keep tied up with a bow. (Character Guide, page 121)

Vincent appears in "With Father!" by Yana Toboso in the Rainbow Butler 2 anthology. In that non-canon story, he talks about wanting to have a daughter too, and remarks that she could never be an idol though as Phantomhive women are all "strong-willed."

This is not the anthology story he appears in: "Elastic" by Hajime Kirino features him as well. (Scanlation: Part 1/Part 2) In it, Kirino provides a possible answer to the question, "How did Vincent make Undertaker laugh to obtain information from him?"