Here’s another:
Did you know that enemies in FE5 can gain weapon experience? It’s hard to notice as enemies rarely get a chance to hit you 50 times, but it’s possible.
It’s even harder to notice because many enemies only gain WEXP 20% of the time.
Interestingly, each character has WEXP ‘growth’ rates for each weapon type. Player units all have a 100% rate for each type and many enemies/NPCs have 20% rates.
I haven’t really tried to find a rhyme or reason behind which units get the 20% and which gain full WEXP. I don’t know if there’s any consistency, but there’s definitely an outlier: the midboss of chapter 12, Kolkho, gains 200% WEXP with axes and 0% WEXP with all other weapons.