Interesting idea. How would you do familiars in Dungeons and Dragons if they were playable?Familiars.
There is no balance reason to avoid at-will. Tiny has perks, situationally, and is modest. And switching Size back-and-forth would be fun.It's not at will, but that's how the Small Fairy works in 5e.
Yes, I’m thinking 24” to 30” tall on average. In 5E they’d be tiny just like the monsters.Do you want the pixies and sprites to be tiny races/species?
Unfortunately, any game that includes melee attack ranges is going to be leery of creating an actually Large player race. Going from "I can strike 8 squares, or 24 with reach" to "I can strike 12 squares, or 32 with reach" is a HUGE buff for melee and completely useless (or even detrimental) for anyone that drops unfriendly AoEs, including other people in your party. That kind of wildly build-specific power, where it's phenomenal in one specific way and weak/terrible for anything else, does not play nicely with most ideas of game balance.Genasi are the only popular species missing from the 2024 Players Handbook.
I am still waiting to see a truly Large player species.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.