pun on the word straight. A joker that is either bent in a 90degree angle, or else maybe a boomerang? it allows a straight to be made with five adjacent cards with fold in the middle, like
6,7,8,7,6
9,10,J,10,9 (etc)
Or an even more potent version, perhaps the image of crotchets on a stave., and it allows a straight bend anywhere, or have multiple bends:
2,3,4,5,4
J,10,J,Q,K
6,7,6,5,6
Similar idea but for Three of a Kind, and also the triple matching ranks of a Full House:
The jokers image is of a “neighbour note” pattern on a music stave and it allowes Threes of a Kind, and the three matching cards in a Full House (but not the pair) to be made using one card of an neighbouring rank, (and aces are considered to be adjacent to K’s and 2’s) so:
J,10,J (three of a kind)
J,Q,J (three of a kind)
4,5,4,A,A (full house)
A,2,A, J,J (full house)
More potent version, it also works for four and five of a kind (one card of neighbouring rank allowed in making the match),
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Another idea is a face/off looking joker and it allows flushes to be all blacks / all reds, so flushes can be made with hearts&diamonds or clubs&spades. Essentially the joker version of the checkered deck.
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A joker that gives all cards in one suit (random each blind) wild card status.