The addition of weapons or gadgets does not a better character make. While I admit that I fancy the idea of Sally with a sword (with Antoine not having one) and plan on giving her one at some point down the road in my writings (don't hold your breath, Stranger; the sun's bound to have gone nova by the time I get that far), it would function as much as a symbol for numerous themes concerning lineage, monarchy, anointing, leadership, aggression, etc. as it would a weapon to smack things with. With Flynn, however, the addition of a weapon is likely just a means of being able to write Sal the same as everyone else in the pointless, weightless fight scenes that dominate the narrative, as it means he doesn't have to focus on her established strengths, which lie outside direct combat.
Well, the comic was intended to be an action series since the beginning. If you're looking for something deeper with lots of character development, you probably won't find it in a series centered around a fast hedgehog that makes a living off of battling robots.
I don't know Sonic has dealt with a lot in his time...Sonic is more than just a fast hedgehog, he is a protagonist and hero and as with all characters he must have something to fight for our the narrative is meaningless. I mean Sonic fights for Freedom...that is one of the most poiniant virtues of the world.
Cap' if you want that you best go read EoT...that's what it's meant for (writing the last two episode outlines has lead to some of the deepest character driven work I have ever written).
As for weaponry for Sal...Nichole. Nichole is her ultimate weapon the same way the Sonic-Screwdriver is the Doctor's "weapon." Ultimately she solves problems that a fist can only make worse. As for a direct weapon for self-dense in my work it's her own acrobatic and hyper-flexible, arboreal physiology as well as a peculiar weapon called an Ipsus-Pistol.
