i think one aspect of Fire Emblme that Robin tried to do, weapon changing, could be implemented somehow with Chrom's swordplay.
The Falchion is his signature blade, sure... but it IS pretty weak. Oe of Chrom's specials could allow him to swap around some weapons for some effects, and he can use them til they break, such as...
Silver Sword: + Damage, - Speed
Armorslayer: + Shield damage, + Damage and Knockback, + Reach, - Speed (much - Speed than above), ? More weight (could hinder or help...)
Killing Edge: + Faster start-up for attacks, + Reach, - More ending lag
Brave Sword: + Faster Start-up for attacks, + Less ending lag, - Damage and Knockback - Much more fragile
Levin Sword: + Range (extra range for thunder sparks), - Damage (due to Chrom having low Magic)
Sol: + strong Self Heal on hit (1/2nd of damage?), -Speed, - Much more Fragile
Glass Sword: + Damage, + Speed, + Knockback, - Much more fragile
Rapier: + Shield damage, + Damage, - Knockback, - Reach
Superior Edge: + Shield Damage, + Priority, - Speed
Roy's Blade: +Power at the center of the blade, - Power at the tip of the blade (spikes and meteor smashes Chrom might have are only for the sweetspot), + Fall speed, - weight, + t3h ph1r3z
ok, i'm only mildly kidding bout the last one but i think it's a good idea to bring some of Roy's stuff back if my idea holds water.
Maybe this could be limited to a few specific moves, whereas in others he is always stuck with the Falchion. Some of the blades i listed could be Custom move options... and if they are feeling like it, some axes or Lances could make the jump
By the way, folks, how do you see Chrom's physics working? Most people envision him as a lighter, faster and weaker Ike... i feel like chrom might not be that exactly.
Here's how i'd want Chrom:
*Fast at the ground, with poor aerial mobility
*His attacks have mild power, a bit stronger than Marth's sourspots
*He has a good jump, but poor recovery (anyone remember my Aether idea? that could actually go far, but if he doesn't have super armor...)
* Is a bit heavier than the average, with a decent fall speed.
*obviously good reach due to sword
* A good combo-oriented character
* Has trouble finishing people off due to his lower-than-usual knockback growth
* Prefers horizontal slashes instead of broad swings like we see in Ike's Fsmash
* Has a forward stab for either a tilt or aerial.
* Should be invincible just like in Robin's Final Smash... jk