I’ve been doing some light research into Little Busters! and, the character images I found for Natsume Kyousuke felt like it be a near perfect representation of Aoric’s style.

Also, if you haven’t read this yet, it’s quite insightful into the whole field of VN development:
Impact of KEY

zanaikin’s last blog post..Documentation Log Mar.21

I think Lothair’s design is probably the most solid of the three - it really does fit his personality well and makes him look like a trustworthy friend. I agree with Zanaikin that the armor looks a bit too light, and I actually think you should match the design to Aorin’s as much as you can.

Exelar’s uniform is pretty stylish, eh? ^_^ His expression is just right, but… I can’t quite place it, yet he looks just a bit too plain for someone with so much responsibility on his shoulders. Not my favorite design.

Aoric’s earrings definitely have to go. He looks too androgynous with them, and that’s not GAR at all. I like his boots and his “all-business” pose and expression, though. I feel like I recognize his hairstyle, too. ^_^ You may indeed want to “take a little off the top,” as Zanaikin suggested, but for the love of Haruhi keep the hair spikes. They’re distinctive, and I think they make Aoric look tough. If you let his hair fall naturally, he’ll look so much like Lothair…

The good news? All these characters look more or less male, so mission accomplished there.

They still look the same to me! xD

Anyways, real comments this time:

Exelar definitely looks fine, his expression is just right too. His hair reminds me a bit of Tatsuya’s from Yoakena, (I can’t find a mainchar CG on the August site) and Koji Hirose (upper left) from Hanihani, which may make a good reference point. Remind me to show you those games’ CGpack and fanbook next time.

Lothair’s armor isn’t quite what I imagined, mostly because they’re a little too tight-fitting, and as a result looks significantly lighter (more like medium armor than heavy full plate). But, I guess that’s what happened when the artist is too used to draw girls (xD). Either way, that’s something very easy to fix anyways. We’ll discuss on the details later.
Also, since the Arcanum has a lot of the knights-in-shining-armor stereotype behind them. He needs a bigger cape, hanging from both shoulders.
His facial features and expression is definitely fitting for his more peasant side.

With Aoric, the earrings (at least those things look like earrings) is a definite no, it doesn’t fit his professional image at all. He looks a bit like he’s in bad need of a haircut.
His expression is just right though =).
I think the main thing is the fact his hair has two bumps with a split down the middle giving off the impression of a lot of hair piled up on top (as if he’s only been trimming the sides for… however long). Not sure if that might be better with a rounded top instead.
His two hair spikes in the front makes it seems like he uses hair gel to fix that, something I can’t quite see him doing. If anything, having the hair fall naturally is the best for him.