Red-Eyes B. Dragon and Red-Eyes Zombie Dragon are the main target of Red-Eyes Spirit when they are sent to the Graveyard. These cards have decent stats which gives you a solid offense and defense capabilities.
Cards of the Red Stone can be used when you have a Level 7 Red-Eyes monster in your hand, send the Red-Eyes monster from your hand to the Graveyard then draw 2 cards, you can then send another Level 7 Red-Eyes monster from your deck to the Graveyard.
By sending Red-Eyes monster (Except Red-Eyes B. Chick) from your Hand or Deck, Red-Eyes Insight lets you get Red-Eyes Spell/Trap from your Deck then add it to your Hand.
Red-Eyes Wyvern is a 1800 beater that has a great effect. If you didn't summon or set a monster in a turn, you can banish this card from your Graveyard during the End Phase to Special Summon a Red-Eyes monster from your Graveyard.
Meteor Dragon Red-Eyes Impact is a Red-Eyes support that can protect your other Red-Eyes monster from getting destroyed by battle or card effects. The ability is quite useful, but since it's a Gemini monster, it needs to be summoned again after it's summoned to have the ability available, making it much harder and slower to achieve.