Hybrid Monsters
From Yu-Gi-Oh Card Maker Wiki
Hybrid Monsters are colored dark green, not to be confused with Spell Cards. But like Fusion Monsters and Synchro Monsters, they may only be included in the Extra Deck, and cannot exist in the hand or Main Deck. If a Hybrid Monster is returned to its owner's hand or Deck, it is instead sent back to the Extra Deck.
A Hybrid Monster is a card that consists of 1 Monster Card and 1 or more Spell or Trap Cards. A Hybrid can only be Summoned by having the required Hybrid Material Monsters in your hand or field, and then activating "Molecular Fusion." Hybrids will always have an effect, usually a combination of the monsters and other Hybrid Material cards' effects. Hybrids are immune to the Spell/Trap Card that is the other Hybrid Material card. Hybrids were first introduced in the FTCG Booster Pack, DNA Experimentation.
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A Few Examples of Hybrids Are:
