Give me the rundown on this Peter. Is he globohomo shill?
He's an ex-Fidesz (Orbán's party) member who left the party after the minister of the republic got into a pedophilia-related scandal (she pardoned a guy who was convicted for covering up a child sexual abuse case). Politically, he is a center-right/right-wing populist, and many of his policies have the same goal as Orbán's (like helping families and making people have more children). His main focus is fighting corruption, taking money stolen through said corruption back, and dismantling the "Gyurcsány-Orbán system," a task he describes as ending communism in Hungary for a second time. This means raping the old political establishment so hard they wouldn't be able to recover ever again, and this would affect the ruling Fidesz and many opposition parties, such as the left-wing DK.
While Magyar is pro-EU and anti-Russia, he opposes Ukraine's fast-track membership to the EU and wants to do a plebiscite over whether Hungary should allow Ukraine into the EU or not. He also refused to help the Budapest Pride parade when the government threatened to ban it and said things like "Social issues like euthanasia or LGBTQ rights should be debated on a national level." His most pro-LGBTQ take is that "He would prefer same-sex couples adopting children over having those kids in a negligent foster care system, but it wouldn't be him who would decide this, but the Hungarian people." Other policies include opposing the usage of foreign workers [there are 120,000 of them in this country of 9,500,000 (this is a lot, and Orbán wants more)], claiming they're bad for economic growth, maintaining harsh measures against illegal immigration (such as the border fence staying), developing rural settlements, and helping small business owners and smallholders.
The Hungarian state media really wants to paint Magyar as a left-wing globohomo liberal for being closer to the political center than Orbán (jurnoscum are evil and insufferable liars, regardless of whether they're left-wing or right-wing). The few things that make him closer to the center than Orbán are being pro-EU, opposing Russia, and refusing to engage in culture war rhetoric, unlike Orbán, who runs his electoral campaign on being anti-Brussels/anti-LGBTQ/anti-immigration and tries to smear Magyar as the polar opposite of everything he stands for. Considering Magyar was a Fidesz member for years and he only left the party after the government got into several major scandals, there is no surprise why he would pursue almost the same politics as his former party (his party is now a member of the EPP, a European political party Fidesz used to be a member of). So the reason why I think that he's not a puppet is that he clearly took a right-wing position on a few social issues (like immigration) that only parties like AFD or Reform UK would dare to take despite being way closer to the political center than either of the two.
He's not a "based and redpilled" politician, but he's not a liberal globohomo puppet either. He seems to be an ambitious, yet optimistic (

) politician, who wants to have a more democratic political system and functional country (let me tell you, Fidesz has been doing a pretty poor job running the country despite having a 2/3 supermajority in parliament for almost 16 years), and he's taking a right-wing approach for achieving these goals. The reason why he enjoys support from left-wing liberals in the country is because they see him as the only competent opposition candidate, not because they like his policies. The Hungarian political system also heavily favors the winner, as it is possible to achieve a 2/3 supermajority in parliament with less than 50% of the votes (and you need 2/3 of the parliament's support to pass a law), so many people are strategically voting for him, and a few non-establishment opposition parties even decided to not run just to get their voters to vote for Péter Magyar and his Tisza party just to help him get rid of Orbán.
Whether Magyar keeps his promises, tries to become a 2nd Orbán, or turns out to be a puppet of Brussels in the case of him winning, only time could tell. The only thing I can tell is there's no amount of being "based and redpilled" that can substitute proper governance, and I'd rather see a meteor hit Budapest than have any of Hungary's establishment political parties be in charge of the country ever again. Fidesz, DK, and the many old opposition parties—both left-wing and right-wing—are so terrible that I would even vote for someone like Hitler or Trotsky as long as he promises to remove them from power forever. If Magyar wins and he sucks, a replacement could come in 4 years; if Orbán wins for the fifth time in a row, he will make sure no one will be able to contest his party's rule over the country ever again like Magyar did. My main problem with Orbán and Fidesz is not their policies—I agree with many of those—but the incompetence, the massive amount of shameless corruption, and other scandalous deeds, from trying to memoryhole the case of a child sex ring operating inside the governmental foster care system to backstabbing the Hungarian diaspora (Hungary used to be bigger; WW1 happened; Hungary lost the war and lost territories where many Hungarians still live to this day) by supporting politicians who like to oppress Hungarians like Robert Fico. For now, I will be voting for him just to buck-break the political establishment; if he wins and he doesn't try to replicate the old system nor abandon his right-wing policies in favor of being a globohomo politician (just like how German "conservative" politicians do it), I would be more than happy to vote for him again.
TL;DR: Magyar is an anti-establishment, pro-EU, right-wing populist who wants to remove Orbán and his anti-EU, right-wing populist political establishment from power.