These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Mobile Suit Gundam Seed Astray
Crazy Awesome: Lowe Gear. This is the guy who fashioned a katana for his Gundam, and later forged a 150 meter version of it, just because he thought that would be awesome (the sword is mounted on the side of their ship, and requires special equipment to wield). He also once attached a BaCUE head to the Red Frame's hand for use as an impromptu double beam saber (this being the only reason he bought the BaCUE head at a junk auction).
Also T.M. Revolution's Zips during the action sequence in the Red Frame animated short!
Ensemble Darkhorse: Astray's storyline still continues despite how the SEED movie has been trapped in Development Hell and may never release. It's also very telling that one of the few Perfect Grade models ever made is the Astray Red Frame. That in of itself should tell you how popular the series is.
In all fairness though, the delay is primarily due to lead writer Chiaki Morosawa having cancer. Being threatened with Author Existence Failure is a pretty good justification for major delays.
Also Shiho Hanenfuss, the mute Ensemble Darkhorse of SEED anime, has much more role in Astray. Though still a relatively minor character, she actually speaks in the manga (she would have spoken in the anime, mind you, but her voice actress bailed).
Les Yay: Very briefly when the Professor and Erica Simmons greet each other, with the sparkle-and-flower imagery coming up during their embrace. The manga's SD comic strip lampshades the author's intent when the two go somewhere private for some "catching up to do", leaving Lowe and the rest of the gang to assume that they're gonna do it, and then subverts the trope as it turns out that the two are actually catching up on their study of Orb's mobile suit development.