Stitch and Vanellope. It's been so long that I've liked those characters that I can't quite pinpoint why I became 'obsessed', though their personalities are similar and I love the designs.
Lucina from Fire Emblem. Weird one since there's nothing massively noteworthy about her from the top of my head. I do like the design and her introduction in Awakening was cool, as well as the concept of her being from the future and """"wearing a disguise"""" (terrible disguise...And why have a disguise when literally nobody knew who she was anyway?). Her personality is passable but nothing standout though which is why I'm not sure where the obsession came from given there's characters I overall love far more in the series. She has always been one of my main/favourite units in Awakening, but I don't really know where the point of obsession came from.
Smash definitely helped with this though since I did jokingly start using Lucina (I had never 'got on' with the Fire Emblem characters in Smash before) to annoy my Marth main friend, constantly referring to Marth as a Lucina clone, saying that I don't know who he is playing as since I'm playing as the """real""" Marth. Obviously this turned into me becoming a Lucina main.
Godzilla. He's a giant monster who fights other giant monsters and destroys stuff. He's just cool.
Of all characters, CATS from Zero Wing... the "all your base" guy. Not only have I loved the meme since I discovered it, but that's just a really cool character design x3
i was obsessed with mickey milkovich for a couple years but for the past year i?ve been obsessed with james from teotfw - idk what it is about him since his character portrays a lot of traits that are just ... not the vibe lmao, but he had one of the quickest character developments that i?ve ever seen and he went from a supposed psychopath to a regular traumatized boy in the span of 8 short episodes; idk, despite all his flaws and all the awful things he?s done, he?s fairly easy to understand and there?s just something about him that makes you love and want to protect him lol
i’m honestly obsessed with mickey milkovich from shameless and james from teotfw; i’ve also fallen in love with characters from grey’s anatomy which is risky since they all seem to die lmao
Tons, but the most prominent ones for me at the moment are John Egbert (Homestuck) Aradia Megido (also Homestuck), the Prince of all Cosmos (Katamari), Sayori (DDLC, one of those games that I'll never play anyway ), 9-Volt (WarioWare), and King Boo (Mario franchise).
If a show had more than one girl character I'd inevitably pick one to say was me, since I was a kid I'd do that and I still do lol
Some of them are Lagoona Blue from Monster High, Cedar Wood from Ever After High, Toph from Avatar, Pidge from Voltron, Lapis Lazuli from Steven Universe, Misty from Pokemon, Yang from RWBY, Starfire from the Teen Titans, and other I must be forgetting. I was utterly obsessed for each of these at a time for weeks to years.
Howl, Legolas (LOTR only), Indianna Jones, Jareth. And an unhealthy obsession with Freddie Kruger when I was really young, too young to have been watching A nightmare on elm Street.
Nagisa, I love her so much! And I have an embarrassing amount of anime crushes from when I was younger Most recent one being Claude from Fire Emblem Three Houses...
I'm not sure if obsessed is the right word, but I have numerous crushes on fictional characters. Most are from movies/television, but there are book, comic, and video game characters.
A couple of examples are Cosmo Brown, Sky Masterson, Beast (BatB, animated), Professor Layton, and Dreamfinder (comic).