Bishop Barron is a well-known name, as is the EWTN television network. Father Mike Schmitz probably comes next in line for being well-known. He is popular among young Catholics because of his YouTube channel and because he has been a speaker at the SEEK events (a huge every-other-year conference for Catholic college students put on by FOCUS). Father Z and Father Ripperger are known mostly only by a smaller group of the most traditional leaning Catholics.
I think Catholics passionate about their faith are at least somewhat likely to engage with non-Catholics and/or non-Christians about their faith. Catholic parishes are maybe somewhat less likely to get together for ecumenical events with other churches, but it’s not at all unheard of. (It’s a two-way street, though, because there are some protestant denominations that have no interest in doing things with Catholics. )
In my area, Catholic parishes are most likely to join with other churches not for liturgies but for charity, such as shelters and meals for the homeless.