I don't really care about characters' birthdays in general, but Kirby is such an incredible series I feel like gushing about it.
Kirby's awesome because it was created to be a game for beginners/people new to video games. As of today, I feel like it's a game series that can be enjoyed by just about anyone, which is quite a feat when you think about it.
For instance, you have anecdotes of how some parents and their kids play the game together, because the game is made to be enjoyable regardless of which generation you're from.
While the game's main adventure often is easy (too easy depending on the title), you nearly always have extra modes for players who want to challenge themselves (Arena, Ultimate Arena). What's good about this is that you can feel like you just completed an entire game regardless of your level.
The same goes for lore, or collectibles, or those who like to 100% the game. You don't need to focus on any of that and the game feels complete even without all that, but it also leaves the door open for people who want to push things further.
Although one could see this kinda stuff as the norm for games, I'd disagree. You won't enjoy the Yakuza series very much if you ignore the plot, you won't enjoy a fighting game if you don't know how to inputs, and if you compare Kirby to other platformers, Kirby is far more forgiving; you won't beat a Mario game as easily as a Kirby one despite the games not being the hardest thing in the world.
Gameplay aside, the world of Kirby itself is just so cute and inviting yet doesn't feel lacking in intensity.
The artstyles and art decisions (like Kirby splitting in 3 and doing his little dance) are really enjoyable, despite often changing! No Kirby games look like Kirby Dreamland 3, which is in a pastel-like artstyle, and King Dedede himself keeps changing designs nearly every game.
But the characters embody that to the highest degree.
Most of them have soft shapes/bouncy shapes and literally are around 20 cm tall (Kirby is 20cm tall) yet you aren't just given childlike threats, with the final boss usually being some Lord of Darkness and Destruction, ancient computers of a forbidden civilisation, World Enders, or a more dangerous Mewtwo that clashes a lot with what you'd expect yet end up making perfect sense within the world of Kirby. Besides the bosses, some mini-games are literally Kirby and friends doing things like punching through their entire planet or playing baseball by sending meteorites hundreds of lightyears away for fun. These guys might barely reach your ankle, but they sure can kill you (might be why the American Kirby commercials often had him eating or beating people..)
Or, talking about how badass they can be in personality, you have King Dedede protecting his subjects (Forgotten Land) or even Kirby just wrecking havoc in Revenge of Meta-Knight with the entire crew panicking and staying true to their captain till the very end (with the situation really being treated as them spelling their doom). Kirby even sometimes is called things like the Pink Demon.
To match, the lore, while not especially thought-provoking, is like, really interesting? With things like Galaxy's Greatest Warrior Galacta Knight, the Ancients and their civilization, origin of a lot of plot relevant artifacts, the existence of the Dark Matter species and Void Termina or even the downfall of an entire human civilization. Hell, some big games aren't even close to that
Though the best thing is Kirby himself, as a concept.
First off, his whole gimmick was super revolutionary for the time. Even before the copy abilities, being able to inhale and spit enemies whenever was much harder to implement than nowadays. And copy abilities gave a secondary use to enemies which often are glorified obstacles (ex: Super Mario Bros, though Koopa shells could be seen as an exception).
Secondly, he just has a simple design.
And at last, while it got lost in most western countries (with Kirby being a "he"), the character doesn't have a specific gender/has an unknown gender. Kirby's VA doesn't voice him based on any specific gender, and him being unknown makes a lot of sense. It doesn't mean that Kirby is non-binary or anything (I don't think he cares about anything more than shortcakes and friends), but it once again pushes the fact that Kirby is for everyone. Everyone can identify with Kirby, regardless of who you are, how old you are, or what you identify as.
The point is also hammered with events heavily associated with one gender, like Valentine's Day for girls (in Japan) and White Day for boys featuring our little hero.
Having a main character players can emphasize and identify with can be a hard task (often the game will simply let you name the characters), especially one with an actual personality like Kirby. But I feel that Kirby simply nailed it.
Kirby is for everyone, and everyone should give him a chance.
Afterthought: Not all my posts are gonna be this long (thank goodness) but if I feel like writing some essay on whatever thing I have on my mind I hope Cohost will be the place to do so.