I'll write a post when I figure out [s]what adjectives to use to describe shirtless Tacomeme[/s] what I want my post to be about.

[quote=@Raijinslayer]
Quick question to through into the air: How do you guys feel I'm doing on writing for Kazuya and Takeshi's interactions with each other, as well as their general temperament and attitudes?
[/quote]
Sure. I'll try not to make it too character analysis-y though. And it goes without saying that this is just my opinion and I mean no offense. 
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Note: this is only taking into account information in this IC, and whatever was kept from the previous one is not being counted. I'm also assuming these kids are supposed to all be buddies instead of a bunch of vagrants squatting in the same space who don't really care about each other. 

As far as their interactions together go, in the two or three posts that I've seen them interact, they don't quite strike me as friends. Whether that's a good or a bad thing is up to you, but so far it's mostly been threats, sniping, and fighting with little allusion to underlying camaraderie apart from Takeshi's protectiveness over the group as a whole. As a result, the read I get from their dialogue and actions so far is more "I hate the other" than "vitriolic buds". Again, not necessarily a bad thing depending on how this ends up being spun, if that's your intent.

In regards to their general personalities, you post mainly from Take's POV so he's pretty obviously more well-characterized than any of the other kids. I will say though, that the way they fight really tells me a lot about who they are as characters. The aggressive Takeshi is all about charging and striking, which is expected, but it's Kazuya's reactions that strike me as particularly telling. It seems he's supposed to be the peacekeeper of the group, but he doesn't apologize or anything, he just tries to make Takeshi submit by countering with locks and stuff. Likewise, he seems to be the one that actually starts everything, even if he doesn't throw the first punch. In short: you have correctly portrayed the experience of an older sibling. Congrats.

For Takeshi specifically, I can appreciate how straightforward he is as a person, and I rather like how it appears that he gets embarrassed easily. Although I kind of feel like he accepts the situation too easily for how wary he was described as being, but I can justify it easily enough in my head through what I know of his personality, so it's not that jarring. Note that that means you've characterized him enough for me to be able to see things from his perspective in like five posts. So overall, good job I'd say.

I don't have enough on Kazuya to say anything other than he's snide and condescending, but not as above it all as he seems? You could probably benefit from switching to his POV once and a while.