Elio takes 7 orbs to resurrect, unlike most Gold characters who need 10 orbs. At first, it might look like this is just a gimmick, but then you realize that he's Shirley's and Theodore's son, so he's half human, and Shirley resurrects at 4 orbs, so since 10+4=14 orbs, and then divided by 2 (since he's half human) equals 7 orbs, it makes sense that he would take 7 orbs instead of the usual 10.
Shirley cuts herself to grant her allies Armour, which seems strange until you consider that a) the members of the Feather Tribe are said to have flesh and blood comprised of pure soul energy and b) Shirley is a Feather Tribe demihuman.
The subtitle Sunset for Sdorica's Season 1 storyline actually hints at a few things happening in the story:
First is the civil war between Angelia and Theodore, which causes unrest in the Kingdom of the Sun. Thus, the term "Sunset" can mean that the Kingdom of the Sun is going down.
The second is some sparse tales on how some people are aiming to revive Sdorica. In the legends, Sdorica ruled over immortal humans under endless darkness, and his death brings out the sun. So, if he ever returns, the sun may well go out and darkness returns, like sunset.
Season 2's subtitle, Mirage, also sets the tone:
First, Rei isn't as forthright and honest in her interactions with the Watcher.
A lot of things in the Desert Kingdom aren't what they appear to be: Devious, the beloved high priest of the Snake God religion, is actually a Dracontine who hijacked his body; Diana, the current queen, is actually the real Diana's body double forced into the throne by her primary supporter Lazer; Lazer, the queen's right-handman, earns his derisive nickname of chameleon. Misa's miraculous healing power is actually the result of a medicine that is secretly given to her by Devious. And last but not least, the Rib of the Snake God that people of Desert Kingdom worship is Sdorica's tooth.
In Chapter 17, Aosta removes the Character Mineral from Experiment's neck, killing it. If that weren't enough, Aosta's realized the person who meets the criteria to host that Character Mineral...is Elio. This was foreshadowed in Chapter 12, and indeed, Elio's affinity for Life Magic might have been a major factor.
There are children working in the Atlas mines. Atlas happens to be a monster infected hellhole and people catch Void Disease and die all the time even before the inhale-exhale pattern started going awry. Hyde was just one of the ones lucky enough to survive. How many children died from this disease? No one would bother to find doctors, much less Void Disease specialists for the orphans...
During the Civil War, Angelia visits the castle ruins in Atlas to reuse Rayzor, and to get to Nigel's good graces, seeing that he has taken home in that ruins and thus the "owner" now, she, by Izumi's suggestion, compromises by surrendering Rayzor's blueprints to Nigel so that if he thinks she's trying to use it against him, he can shut it down.
What sounds like a desperate trade actually has a much more sinister undertone: Remember, Izumi is a Dracontine, and with Nigel under his thumb, Izumi likely can retrieve Rayzor's blueprint anytime for his use. With that in their hands, imagine what the Dracontines can do by creating a limitless supply of Rayzors... and even if Rayzor needs a massive influx of Soul Energy to use, if Devious, another Dracontine, is taken into account, what's stopping them to slaughter masses to collect their soul energy as fuel for their next firing of their Rayzors?.
