I'd recommend 'Dog Man' series. They have colorful illustrations and simple but engaging stories that 3rd graders usually love.
For those kids, 'The Bad Guys' could be a great choice. The characters are funny, and the plots are exciting. It's also not too difficult for them to understand.
You might consider 'Amulet' series. It has wonderful graphics and adventures that can capture the imagination of 3rd graders. The language is accessible, and the storylines are full of surprises.
Chapter 420, "Terrifying Spiritual Energy, Tearing Through the Ship's Shield (Part 3)", is the clearest early answer because it turns Green Skin's situation into a concrete plot event. The chapter gives readers a real answer by opening on On the bridge of the Concerto, Gu Hang stood with his hands behind... and ending on Without shields and with a flawed structure, the orc flagship....
Chapter 342, ", 4 years", is the clearest early answer because it turns Korolya's situation into a concrete plot event. Early on, Four years had flown by, and this marked the fifth year that Lucy Lee.... By the end, Fifty million Star Realm Armed Forces, or a billion native troops –....
Chapter 337, ", Expand the Army", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. The chapter turns that into something concrete by moving from In Gu Hang's eyes, Korolya III was now a world filled with despair. to Could Gu Hang be a dog for the Parliamentary Faction?.
Chapter 419, "Turning the Tide of Battle", is the clearest early answer because the buildup finally cashes out in a real clash. The setup is Before the retreat, the human army wouldn't initially destroy the..., but the pressure keeps building through However, over time, they realized that the Green Skin Orcs had....
Chapter 459, ", Cruiser Technology!", is the clearest early answer because it turns Alliance Land Forces's situation into a concrete plot event. The setup is Now, "Overnight Success." Even higher echelons had already opened..., but the pressure keeps building through He was only at level seven and could ascend two more levels;....
Chapter 389, ", Capturing the Planet", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. Early on, Four hours of space combat had yielded some victories for the Tianma.... By the end, Their current responsibility was to transport the landing troops.. Inside the broader faction conflict storyline, the chapter closes with He had joined the Dragonhawk Legion for only about a dozen years.
Chapter 357, ", Meat Mountain", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. The setup is He didn't count on a cloud of poisonous fog to completely seal off..., but the pressure keeps building through Just a little bit longer and the elites guarding outside the core....
Chapter 430, ", No Hope Left, Await Death", is the clearest early answer because the violence around Battle Moon becomes final instead of hypothetical. A useful checkpoint is the way the scene starts with However, just when the human soldiers and Sect of Mechanics members... and follows through with The Green Skin Fleet, following this newly arrived behemoth, began to....
Chapter 439, ", Temir No.5 Meat Grinder", is the clearest early answer because it turns Green Skins's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Soon, just a few days later, Du Shiliang's United Fleet had been... and follows through with ———— 6k Still owe 62k Paying debts is so hard....
Chapter 401, ", Now I Have Plenty of Money", is the clearest early answer because it turns Lower Nest District's situation into a concrete plot event. The chapter turns that into something concrete by moving from But as far as we can see now, this seems to be the level all across... to What's the worst that could happen if we fail?.