In the Japanese release of Pikmin 2, the Hocotate ship is called "Dorufin Shogou Ki", which roughly translslates to S.S. Dolphin First Model.

What is the Hocotate Ship called in the orginal Japanese release?

In the notes for it, Olimar displays aversion to the Unexamined Nest, a 12-hole ocorina. The species name for the Stuffed Bellbloom (given to it by Olimar) is also trypophobis. 

Trypophobia (fear of clusters of holes/bumps)

What phobia does Hey! Pikmin imply Olimar has?

While unused, Louie does have a memo log that takes place after he escapes the Drake and before the mireclops eats him. 

Louie has a a memo log that stars only him

He has twelve older brothers, one older sister, and one younger brother for a total of fourteen siblings. 

How many siblings does Alph have?

The only members of Charlie's family that are refrenced in Pikmin are his pet duck and pet dog.

Who are Charlie's known family members?

Atsuko Asahi is a composer for Nintendo. She provided voicework for both Brittany and the winged pikmin.

Who is Brittany's voice actor?

The S.S. Dolphin has two parts that were gifts from Olimar's kids: the sagittarius and libra. In his monologs about each, he mentions how they were named after each child's astrological sign.

What are the astrological signs of Olimar's kids according to the first game?

In pikmin 2, Olimar admits to being bad at videogames. In pikmin 3 deluxe, it is implied he is also bad at singing as his attempt to sing with the pikmin resulted in them going silent and staring at him. 

Which of these is NOT something Olimar is stated to be bad at in the games?

Most characters do not have their ages stated. For Olimar we get a vauge "no longer young, but not quite old either". For the president, however, we have a clearer answer of "over 50" based on an email he sends in Pikmin 2, wherein he states having been in the industry for over 50 years.