This may belong in Fun and Games instead of general, so lmk.
I had some good DC characters as well, but obviously this is not the right wiki for DC characters, so I present my best Marvel characters. A lot look kinda ass because the website is more medieval themed but whatever.
Adam Warlock
Although I did not know much about him when GOTG3 first came out, I now have him as a favorite character. After reading Infinity Gauntlet, and the original Warlock series, I have come to appreciate him as a cosmic entity. Note that he possesses the Infinity Gauntlet here.
Galactus and Silver Surfer
Inspired by the classic arc, "The Coming of Galactus", I think my Galactus and Surfer came out well. Surfer was obviously easy to make, but Galactus was a little harder. I wish I could have better translated the helmet. It also took more Classic elements, like his armored skirt/kilt and shorter sleeves.
Gladiator
A recognizable Imperial Guard member, who looks a lot like an alien from another company, koff koff Superman koff koff. I like the design, and think it came out not too shabby. I always liked him, and the entire guard ever since reading the original Phoenix Saga from '76. My first exposure to him (and Firelord, below) was in Marvel Zombies 2.
Firelord
Firelord, another classic character with loads of power. He is also a member of the Shi'ar (the most goated race). I tried to make him appear more fiery (He is Firelord for Yahweh's sake) but it came out a little weird.
Smasher
I do not know a lot about Smasher, and his successor, Izzy Kane is likely more well known, but I like his design. It kind of combines Shi'ar and Wonder Man. It was hard to translate, and I don't like it much, but eh whatever.
Finally, Vulcan!
Vulcan was always a personal favorite of mine, even if he comes off as a bit annoying. I also liked the Rise and Fall of the Shi'ar, Emperor Vulcan and War of Kings arc. I first was exposed to him with X-Men Red, which kind of got me into comics (along with Jed MacKay's Moon Knight run).
Hope you like them!