There is also a character named Guide-san who will support you in duels (and is similar in appearance to the character on the Tour Guide From The Underworld card)
Regardless of if you're a devout mono-red player, love all things dragons, dig DnD crossover cards, loathe creatures with flying, or just think "Themberchonk" (as Reddit is calling him) is cute he's got you covered!
This means that when paired with cards like Something Tithe or Dockside Extortionist that make lots of Treasure tokens, you essentially will get to drain each opponent for two with every Treasure you make
Green Dragon Ninja Can Negate 1 Spell or Trap card per turn (Hard Once per turn) and thus makes a good pair with Mitsu the Insect Ninja, who can negate 1 Monster Effect per turn, or with Rank 2 Ninja Shadow Mosquito, who can the Negate the effects of Monsters which have Hallucination Counters, And Lastly, Paired up with Blue Dragon Ninja, who can also Negate 1 Monster Effect per turn