Just for fun, post the most similar live-action character for your animated Lawl fighters and vice versa. You can only name Toons if you post sources.

Aitor Molina
Sorry this took a while to answer, had to really think for this one. Some of these were harder to say than others, since some I had to go off of very basic comparisons. Obviously some of these characters don't have as much source as others.
Animated to Live Action
Strong Bad: Logic would say a Wrestleman... I know jack shit about wrestling unfortunately
Homestar: Someone fast but ditzy... for live action many of these are more difficult
John: I was so tempted to put Live Action Aang of TLA just as an excuse to say Aang since Aang and John are similar in many areas, but I don't want to insult John by comparing him to the boring cardboard performance of that awful movie."
Karkat: Michael Jones of Rooster Teeth is basically Karkat's level of anger and angry tangents, and his voice is basically a popular headcanon for Karkat https://www.youtube.com/watch?v=1mNqIS7o4Yg
Edd, Tom & Matt; Their real-life inspirations/voice actors Edd Gould, Tom "Tomska" Ridgewell and Matt Hargreaves (cop out answer I know lol)
Watt/Rosalene: Even though their studies and fields are different, Sully and Mulder of The X Files
Dan: The man himself Mel Blanc, since he was an actor on the Jack Benny Program. Some of his absurdist roles can easily compare to Dan and the spirit of The Dover Boys
Unfortunately couldn't think of anything for Frisk or Viola either
Live Action to Animated
Markiplier: Maes Hughes from Fullmetal Alchemist AKA Anime Markiplier https://vignette1.wikia.nocookie.net/fma/images/a/aa/Avatar_hughes.png/revision/latest?cb=20161108000203
Umbridge: Although not as overly buff/masculine, Sully of Fire Emblem Awakening carries the toughness and demanding discipline, except not psychotic like Umbridge
Stephen: there actually exists a Toon Stephen officially voiced by him, but warning, it's not good. Like, at all. https://www.youtube.com/watch?list=PLX-E3Yw2kf3hPykmNFyj18H74kkMvAK_9&v=6G4UV0J6kWc
Psycho Dad: Any terrible animated Dad can work (even though most I've found are FAR worse than PD), though seasonal rot Peter Griffin could work.

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