I'll start with my active journals.
pokekyon: Kyon + Pokémon = Pokékyon. It's that simple.
gimmeuraliens: Aliens (along with time travelers and espers) are something Haruhi desires to have. I was also considering "ttlygod" at the time, but yeah.
2bamaster: Ash's goal is to be a Pokémon Master. "2BA Master" was also the name of a song/album back in the old days of Pokémon.
shrunkensaiyan: Goku is a Saiyan, who was turned into a child again by the Black Star Dragon Balls.
And now, my currently inactive journals.
pokeredmaster: Ash is a Pokémon trainer, aiming to be a Master, and he's based on the protagonist of the Red version.
peek_at_you: Well, Pikachu can only say his name, and "Peek at you" sounds similar to "Pikachu". ALSO, IF YOU PICK UP ON THE SUBTEXT IN THE SHOW, IT BECOMES APPARENT THAT ASH'S PIKACHU IS A MASSIVE PERVERT WHO IS INTERESTED ONLY IN HUMAN FEMALES. 8| ... No, really. I'm serious.
cascadebadge, boulderbadge & fenbadge: They are Gym Leaders. These journals are all named after their Gym Badges.
sirlordjames: In one episode of the anime, James used the alias "Sir Lord James Jefferson", it was pretty lulzy.
thepokemonprof: I think this one is pretty self explanatory. IF NOT, GO PLAY POKEMON RED/BLUE/YELLOW/FIRERED/LEAFGREEN FOR AT LEAST FIVE SECONDS AFTER THE TITLE SCREEN. 8|
newbark_jackson: His name is
sinnohhareta: His name is Hareta and he is from Sinnoh. Also kinda boring. >_>
codename_looker: His code name, it is Looker. It is what they all call him.
hqlabsnagger: Michael lives at the Pokémon HQ Lab and it's his job to snag the shadow Pokémon.
youngsterben: ... Well, that's his name and "ilikeshorts" and several variants were taken.
orange_hero: Goku is a hero who wears an orange gi. Also the title of the ED theme to last year's Jump Tour special.
shorterthangoku: Krillin is a shrimp. Thus he is of course, shorter than Goku. Even when they were both kids and Goku was also a shrimp, he was still slightly shorter.
chatku: "Goku" played by Justin Chatwin. Yeah.
tallambitions: Commander Red used the Red Ribbon Army to gather the Dragon Balls under the pretense that he was going to wish for world domination. In actuality, he was planning to wish to become taller. Hence, tall ambitions.
catlovesfood: This... is named after an incredibly retarded dub line shortly before Mecha-Freeza arrived on Earth.
sosnarrator: Kyon is a member of the SOS Brigade. He is also the narrator of the series.
cookieomnomnom: He is the motherfucking COOKIE MONSTER. What else is there to say?