Casey's gear
 

How much of it is functional, how much of it is there just 'cause it looks cool?
Lesseee.....
The mask might be ok in NYC from, say, late October - early April, too hot & sweaty otherwise. Also, he wouldn't want to wear it for longer than maybe 20 minutes at a time, for much the same reason.
Hockey gloves would work ok as light-duty boxing gloves once he's actually fighting someone, kinda clumsy & bulky otherwise. Work- or mechanics' gloves may be a more practical choice.
I can see the baseball bat, especially if it's aluminum (wood ones would be heavy), and Casey being Casey, he's probably not too worried about whether or not carrying something like that around is even legal in Euro-wanna-be NYC.
The hockey stick seems a little long and awkward to lug around, but as a hockey player, his heart might be set on it as a puck launcher.
Speaking of pucks, they're not real light, either, how many of those does he carry?
The skateboard-style knee- and elbow pads are an excellent idea for any 'extreme' type activity, the hockey blocker seems, once again, a little big and awkward.
I can totally see the Padlock Of Doom, that's also the easiest item to justify should he ever have to explain himself to cops who aren't Krang. 'It's for my locker.'
The agitator balls inside the spray cans would make sneaking up on someone impossible, since they make quite the racket, especially when running, jumping, etc.
I'm guessing his skates are of the 'aggressive' variety, with the little tiny rock-hard wheels swapped out for taller ones of medium hardness, but here's a puzzler: How does he skate on a subway rail?
That is one very, very narrow and very, very slippery surface......

I always wondered where the power for the tazer was as well. Its powerful enough to disable someone the size of Tigerclaw, its got to be quite impressive. Batteries like that wouldn't fit in the glove, so presumably its on his belt or a backpack somewhere?

Well, with bats, pucks, padlocks & stuff, why not carry a car battery on your belt also......?
Which still does not explain why Mr. Jones felt the need to hook a potato masher up to the tazer.

It's a cartoon.

The potato is the power source, duh! Basic science, you can use a potato as a homemade battery, and it's light enough to carry anywhere.

Yeah but a potato would hardly produce enough energy for a light bulb not to mention a taser :/

Yeah as one of the guys above said, it is a cartoon. I do not think that should be taken too seriously because it was not meant to be too realistic.

I'm not worried about his gear. I think it's cool and the taser glove is even better. Very creative how he did it.