Crimson Longinus
Legend
Definitely not negligible. It is always present. In actual play it tends to matter much more than the long lifespan of the elves for example.The Small size can help flavor a package of clearly nonhuman traits, but by itself is negligible.
Lucky and brave work thematically well together. Both support optimistic and curious outlook. Granted, that doesn't do much with hobbity homebody halflings, and that's why I prefer kendery nomad halflings.Brave is kinda useful, at least when one needs it. The Fear Resistance is better than the elven Charm Resistance, in any case.
If I was forced to choose between Fear Resistance and Darkvision, it would be a tough choice. Darkvision sure is convenient and, situationally, can be useful for stealth.
Mechanically, Lucky is unpleasant. It is infrequent and passive without any player agency. It is not nothing. Some players might find its gambling aspect fun. At most, it is worth a good skill. By contrast, the Lucky feat is worth a feat, grants player agency in vital situations, and outclasses the Halfling Lucky.
Of all the traits that the Halfling has, I consider the Fear Resistance to be the only one with potential to explore as a nonhuman quality. But, of course, the D&D Players Handbook doesnt explore its nonhumanness. Being unusually brave around Undead and Dragon and so on, is noticeable.
The fearlessness slightly conflicts with the childlike qualities, which tend to be timid and nonconfrontational. But it can work, in the sense of children often not understanding danger. A child can walk right into a busy road, jump off a house trying to fly, or play with an electrical outlet, and stuff like that.
The Brave trait is less than enough, but it is something to work with as part of a package of nonhuman traits.