The Battle Pass in Marvel Rivals is one of the easiest ways to earn Units. There's some on the free Battle Pass too, though the premium Luxury Battle Pass does offer more. For Season 0, there are 200 Units to gain for free, and 100 extra in the paid version.
While you can't purchase Units themselves, you can convert the paid currency, Lattice, into Units. To do this, move your cursor to the symbol for Units and select it. Here, you'll get a menu that will let you convert Lattice to Units in increments of 100. The conversion rate is 1:1, so 100 Lattice equals 100 Units.
You can find these by selecting your player icon in the top right corner and navigating to 'Achievements' in the top menu. In the Heroic Journey set, you'll earn points that accumulate and allow you to gain Units. These achievements focus on specific feats to accomplish as a given hero.
You can find these missions by going to 'Season' on the main menu, then selecting the missions submenu. These contain quite specific tasks that will grant Chrono T.
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