The consensus for the comics is that Grand Regent Thragg is the strongest character in Invincible overall, with a close argument that a fully matured Mark Grayson (Invincible) could eventually surpass everyone given enough time.

Quick Scoop: Who’s really on top?

If you’re talking about the completed Invincible comic story and not just the current TV show seasons, most rankings put Thragg at number one.

  • Thragg is repeatedly described as the strongest Viltrumite and “one of the strongest Invincible characters.”
  • He rules an empire based on “might makes right,” which only works because he can dominate any challenger.
  • His feats and long, brutal fights (including against Mark and Nolan together) consistently place him at the very top of power lists.

However, many fans and articles also argue that Mark Grayson (Invincible) is effectively the “strongest by the end” because of his insane growth potential and late‑series feats.

Top contenders for “strongest”

Here’s a quick look at the big names that usually come up in power debates:

1. Grand Regent Thragg

  • Officially ranked as the strongest Viltrumite in multiple breakdowns and lists.
  • Maintains control of a warrior race where only the most powerful can rule, backing it up with ridiculous combat feats.
  • In many rankings and videos, Thragg is put at the absolute top of the food chain.

2. Mark Grayson (Invincible)

  • Starts far weaker than Nolan, but by late series he surpasses most Viltrumites and even outgrows his father.
  • Beats monsters like Conquest and goes toe‑to‑toe with the best of his race.
  • Several write‑ups call him “easily the strongest character with time on his side,” implying long‑term he may outscale everyone.

3. Omni‑Man (Nolan Grayson)

  • Early on, he’s portrayed as easily the strongest being on Earth , stomping the Guardians of the Globe and multiple Viltrumites.
  • For much of the series, Mark is chasing Nolan’s level of strength; Nolan sets the bar.
  • Eventually, though, both Thragg and a fully developed Mark edge past him in most rankings.

4. Other monsters who get mentions

Different lists and videos also highlight:

  • Battle Beast – a terrifying war junkie who nearly kills Mark and pushes even top‑tier characters to their limits.
  • Various cosmic or “end‑boss” level threats that are usually still framed as below Thragg in raw physical dominance.

Comics vs. TV show (right now)

If you’re only up to date with the animated series as of early 2026:

  • Thragg hasn’t fully shown his peak yet on screen, but comic‑based rankings still slot him as the final boss in terms of raw power.
  • The show currently makes Omni‑Man look like the most fearsome character we’ve actually seen in action, but comic readers know there are bigger monsters coming.

So for “who is the strongest character in Invincible?” the safest, canon‑aware answer is:

Grand Regent Thragg is the strongest character overall in the completed Invincible comic story, while Mark Grayson has the highest long‑term potential and may eventually surpass everyone.

Mini ranking table (comics-focused)

Here’s a compact view of how most power rankings shake out:

[5][7][1][3] [1][9] [9][1] [6][3]
Rank (Comics) Character Why they’re insane
1 Grand Regent Thragg
2 Mark Grayson (Invincible) Surpasses most Viltrumites, defeats legendary foes, and is described as the strongest with time on his side.
3 Omni‑Man (Nolan) Strongest hero on Earth for much of the story, casually destroys the Guardians and other Viltrumites.
4 Battle Beast Nearly kills Mark, fights top tiers head‑on, considered one of the scariest physical fighters.

TL;DR: If you just want one name, it’s Thragg. If you like “potential” arguments, a fully grown Invincible might be the real endgame strongest.

Information gathered from public forums or data available on the internet and portrayed here.