In a different thread (Smiley's character thread) I mentioned other traits and such that aren't in the rulebook, but have been published elsewhere by the official publisher. This is a follow-up to that discussion. I thought it shouldn't go in that thread, but somewhere more general. This is the only general thread I can think of, so here is the response.
The publisher (Gallant Knight Games) has an in-house zine call TinyZine. For the first few years they did it, they would collect them at the end of the year in a TinyZine Compenium. They did it from 2018-2021. (Now they're trying a quarterly format with no compendium. 😕) While there are cool things throughout all four, the one I am using for this discussion is the TinyZine Compendium 2019. While the whole thing is 190 pages long, there are 32 pages of just heritages and traits for Tiny Dungeon. And most are included as support for an adventure that is otherwise not part of those 32 pages. For the most part, this list of traits is included in the list given in Psybermagi's trait list! There are also contradictory traits in there, too. For example, they have both a "trait tree" for supporting bards, and (my personal preference) a prestige trait to support bards. Another example is that there are at least three different ways to support two-weapon fighting.
Getting back to the subject of the post I am responding to, there are two base traits to support psionics: Psychic and Precognitive. Psychic is pretty similar to what Psybermagi is doing, but it is a bit different. (Honestly, I think Psybermagi's version is more powerful.) Precognitive lets you test every day to see if at some point later that day you can take Advantage on one roll. (Personally, I'd just give the "one Advantage roll per day" with no enabling roll, but that's me.) If you take either of these, then the Arch Psion trait opens up and that works similar to Arch Mage. The choices for Arch Psion are: Mindbender (charm and illusion), Telekinetic (duh), Hope Wielder (buff others mentally), Augmenter (buff others physically).
For the record, this is also where the Bard prestige trait is. To open the Bard prestige trait, you simply need the Charismatic trait. In addition, it also has Wild Berserker (which requires Berserker and Strong) and Arch Necromancer (requires a base Necromancer trait from the related list of normal traits) prestige traits, too. In another section, there are Cleric-related traits (improved healing and turning undead), too.
Just some thoughts for those who want to go past the base list from the rulebook! (Subject to Psybermagi's permission and interest to do so, of course!)