Okay, so I was thinking of having plushies. This is my idea:

When you beat a boss, you unlock the ability to buy a plushy of that creature.
When you finish a set of armor, you are able to buy a plushy of the knight.
All knights have interchangeable equipment.
All bosses come with a little toy. EX, Snarbolax gets the beast bell, Vanaduke gets his scepter, Royal Jelly gets a jelly minion, Roarmulus twins get a few rockets.
When you get to the core for the first time, you are able to buy "Equipment Packs", which come in a snazzy equipment station. They feature every single weapon and shield, and a few extra helmets.
Certian plushies will have effects, such as:
Love puppies will open their mouths when you squeeze them,
Royal jelly will be REALLY squishy,
Trojans have levers that make their feet move some,
And snipes have a voicebox that makes them tweet when you squeeze them.

So, give me your ideas! Should I try to create these?