Leatherhead
Possibly a Idiot.
All nice, except charger feat rulling. That is some puzzling stuff. It would be like a default thing to do with a mount.
The Charger Feat is only good if you are below level 5. You trade your main action for the ability to run fast and make a bonus action attack with a smidgen of extra damage. The problem with that, is anyone who is really into that kind of play-style will eventually get a bonus action dash via some other feature, and way-way better uses of their action economy.
Even Rogues, who only get one attack per round would be better off setting up advantage with their Bonus Action, or if they have Haste, setting up a Reaction Attack with their main Action instead of using Charger.
It's really something of an oddity in Feat design, where most feats are designed to be at least partially useful even if you can't use them to their full extent, Charger is only useful for niche scenarios and actively goes out of it's way to be useless in every other situation. If it was reworked so that you had to move 10+' to get the damage bonus on any Attack, and then granted you a bonus action Dash instead of an attack, then it would be ok.