I touched on this briefly with Mai, Hilary and many times with Chloe, the point being that alot of popular anime don't do their opposite gender justice. No order for this list.
1. 90% of Harem anime
The lead male is dumb, the lead female is oblivious.
Get the obvious one out the way first, a typical male is frequently beaten up, a loser, accidental pervert; while the typical female is completely oblivious to her situation and has no concept of red flags. Harem is kinda out of fashion thankfully, so it's not really a factor so much anymore.
2. Dragonballz
Bulma dominates the female cast too much.
For much of Dragonball history the very few female fighters we do get were limited to Android 18; Super and FighterZ bridged the gap but even now, Bulma still dominates as the female representative.
3. All Digimon seasons bar Tamers
Female digi-destined were kinda just making up numbers.
It started with Tai and Matt getting all the attention, then it was Davis despite the fact Kari and TK were meant to lead, Tamers did it right but then it reverted back to old habits with future seasons. While Kari provided actually plot relevance, Sora and Mimi didn't.
4. Medabots
They did Samantha dirty.
The sad thing about Medabots is that they had a really good female character in Samantha but they cut her relevance to the plot so much that she may as well have left the anime.
5. Beyblade
It took three seasons to get a decent female blader.
Mariah and Emily were strong bladers refused to be allowed any actual battling. The less said about Hilary the better. Took until G Revolution to finally fix this issue.
6. Pokemon Galar Season
Chloe had nothing to do.
They gave Goh a mission to catch Mew, Ash is the lead so enough said, Chloe had one Pokemon contest and advice from previous female leads, that's Chloe's entire contribution to the anime.
7. Non UC Gundam
It's taken about 30 years for a decent female pilot.
Nothing really against female casts of the non universal century Gundams as they all have strengths in their own way, but the only really decent female pilots we've had are Allenby of G Gundam and this seasons Witch from Mercury, that's pretty poor from a franchise with well balanced gender casting.
8. Yu-Gi-Oh Duel Monsters
Female duelists get a bad rep.
I've covered this already with Mai, other than Ishizu, every female duelist is average, terrible or get through with hand holding, future seasons fixed this.
9. Naruto
Female ninjas are pretty terrible.
Much has been said about Sakura's history, Ino has a poor move set for combat, Hinata is in the wrong anime, Temari lost much of her role after marrying Shikamaru. The adults fair much better but they are not main characters. Oh yeah there's Tenten, what did she do again?
10. Pretty Cure
Despite promoting inclusiveness, there's still no official male Precure.
Hugto Precure broke the mold with the now legendary line "Boys can princesses to" this followed with the first ever male Precure and a season devoted to the message of everyone is Precure, young, old and any gender. That was Season 15, Season 20 is next year, and were still no closer to the elusive male Precure, current season discount Tuxedo Mask does not count.
