At a pretty high level, the Nameless can cast and tank the spell Molten Death, which summons meteors from the sky, something that's confirmed by the spell's description, and it's also shown on the first scan that he can keep up with people who cast cloud-to-ground lightning.With a few level ups, gladiators are fully expected to shake the ground by leaping, reduce people to ashes with spells or freeze them into solid blocks of ice, split even heavily armored people apart with a single punch, and more. Even the lowest-level characters can react to slingshot shots and sound-based taunts at near point-blank range, and with just a few levels, they are expected to be able to react to gunfire, sound waves, arrows and bolts, again, all at extremely close range. Pretty much even the lowest-level characters can take off limbs and heads with a single strike, and literally punch people in two and their hearts out.I still need to play and properly account for stuff of the Crusader redux, IV, some tidbits of III, Medieval, Spartacus, Mini-Fighters, Champion Run and Pirates. I've covered SaS I, II and II redux, III (partially, I still need to re-scan the spells, which have the best hax descriptions of the whole series, it's actually insane), V and Crusader, and the official tome of lore as well.
The protagonist of IV doesn't have feats, I think, and neither V's or Medieval have received official nicknames. The names of the protagonists, as per the Tome of Lore, are: Gladiator (SaS 1), Nameless (SaS 2) and the Starbound Gladiator (SaS 3). Medieval and Spartacus seem to be mostly standalone games. While I've played IV the most, it is the oddball of the timeline, as it certainly happened there and it appears to have happened in any moment of time of III to V, and I haven't checked out Champion Run or Mini-Fighters yet. The timeline is this: Pirates > I > II > Crusaders > III > V.