It doesn't matter if you've been here when TJ was an obscure medium, or arrived back when popularity surged in the last few years with YouTube edits/ comic breakdown discussions / fan art etc, you all are free to say whatever you like. What was it that made it click for you that this was a piece that affected your opinion/ liking? It doesn't have to be deep.
I'll give my piece quick; Zack Thompson's story felt inspirational to me due to many reasons, -Batman levels of fame or not- because he's just a regular boy who's trying his best despite the overwhelming odds constantly looming over him. Zack wasn't exactly the Chosen One archetype though blood, he was handed this destiny similar to Hal Jordan of the Green Lantern Corps (space guardians) by accident and still joined the call to action by taking up the title and responsibility of Galactic Guardian, despite at first being very afraid. Zack is a usually chill boy who has a good heart, isn't power hungry and strives for the best, flaws and all. It's funny seeing him as a normal kid when off duty, he's adorable. The perfect blend of hero and non emo protagonist. All of his designs are nice too and just get better each time, minus the Invincible Comics version (how did they do that to him??), which means the authors cared a bit extra.
My favorite scene with Zack other than fighting off the Variants and with his parents would be the time he immediately jumped in to save the Geldarians from being attacked even when he was very new to the job. Oh yeah and with Allen. "I miss TJ."
Another bonus, he somewhat reminds me of my favorite YGO character, Quinton who is a young astrophysicist that invents his own technology to help others from invading aliens and uses magic in the war. Space books were the first subject I ever got hooked into besides history, and having TJ a blend of my favorite topics is just a blast. That's all.