Some other points:
Happy and Mad have 120 HP. The lowest in the game.
Happy and Mad's stats vary wildly from eachother. Happy has the highest jump in the game (ignoring totem monster's double jump) and the slowest walk speed, while mad has the lowest jump in the game and the fastest walk speed.
If you can see that your opponent will block happy or mad's fully charged neutral attack or super, you can press down and the animation will cancel. You will not do the attack and keep your super meter.
If you hold forwards or backwards during crouch attack you will move slightly in the direction. not really too useful, but nice for microspacing or repositioning.
Happy up attack is completely invincible at the start, so it's a great way to escape if the opponent is pressuring your shield. it can be punished hard so watch out.
in general Happy's moves are very unsafe if the opponent blocks, so don't use her too much at a close range. especially dash attack.
Mad uncharged neutral attack is the fastest attack in the game (frame 2) (ignoring the fact that lily and orbit's Orbit charge is instant, but it will take a while to hit the opponent) if you let go of the charge instantly. this means that it can punish almost every attack that is even slightly unsafe against shield (if you're up close). This includes even dragonfish crouch attack. it can also combo into the amazing combo attack medium charged neutral attack, which can be followed up by all sorts of things, such as dash attack. So yes, this is actually a very good attack. It is not safe if the opponent blocks it, but it can still be hard to react to, so don't worry too much throwing out this attack.
Mad up attack gains him a great amount of pepper meter, even if he misses, so if the opponent is keeping you at a distance, try to use this attack safely a couple of times.
Mad is completely invincible during his super attack until the last hit.
Side note: the super turn around shield ignore glitch (this should really have a better name) is a result of a different mechanic. Normally when a character jumps over the opponent while they are blocking, they can hit hit the opponent from behind. This glitch is the unfortunate result of the fact that mad can turn around while his opponent is still facing him during the super attack, and the fact that the attack hits behind mad. But yes, this will be patched out later. In the previous version there was actually a really niche infinite combo with totem monster. if the opponent jumps over totem monster, but totem monster keeps blocking and then uses crouch attack, the opponent will get hit regardles of if they are blocking, because TM is not facing the opponent's side and crouch, TM can spam this over and over again, becuase the opponent doesn't have enough time to counterattack and blocking doesn't work. in the current version, moves that hit on both sides will still ignore block if the opponent is behind you, but often they won't combo afterwards. except for Mad super of course.