Atticus Rhodes (JP: Fubuki Tenjoin) is the missing brother of Alexis Rhodes. He is a member of Obelisk Blue dormitory that suddenly disappeared along with others students. Atticus witnessed Yusuke Fujiwara (One of his close friends) trying to summon Nightshroud (An evil spirit) by using the Nightshroud Mask to obtain immortality. Yusuke gave the Nightshroud Mask to Atticus as a farewell gift. Atticus then got possessed by the mask. Eventually, he and Jaden dueled in a Shadow Game. Atticus lost the duel, then he got released from the control of Nightshroud.
Red-Eyes B. Dragon
Aticcus' deck revolves around his signature monster Red-Eyes B. Dragon. He uses Red-Eyes B. Chick along with Call of the Haunted and Troop dragon to easily summon it. It's also supported by Swing of Memories and Red-Eyes Wyvern to special summon it from the graveyard. By that time, he'll use it as a tribute to summon Red-Eyes Darkness Dragon that has a very high attack due to the dragon monsters on the graveyard. He also interrupts with his opponent's plan by destroying or disabling their spell and traps. He uses cards such as Mystical Space Typhoon and Mirage Dragon. Another strategy of Atticus is to use Inferno Fire Blast and Red-Eyes Burn to inflict devastating damage to his opponent.
Lord of the Red will likely be his Signature Card for his Starter Deck since Red-Eyes Darkness Dragon requires you to tribute Red-Eyes B. Dragon to summon it. So that's likely either a drop or a Level-up reward.
They could just give him Red-Eyes Darkness Dragon and not Red-Eyes B. Dragon in his Starter. They did it with the Paradox Brothers and Gate Guardian. Also, you're guaranteed to own at least 1 Red-Eyes B. Dragon before unlocking Atticus anyway since you have to unlock Joey prior to unlocking GX, so it isn't a huge issue to do this.
You make it sound like Atticus was around for the whole GX season, which no, he was only around for MAYBE half of it and even that was 60/10/30: Nightshroud vs Comatose vs Overbearing big bro. The other 40% he never really dueled so the only cards he's most known for are Darkness Dragon & CyberDarks, his Nightshroud cards. (I'm hearing Atmosphere too but no one cares)
in the Anime, his normal deck (when he's not being Nightshroud) is implied to be a Normal Monster Beatdown Deck with Red-Eyes as his ace. Though we only saw his regular deck once during one of the later seasons.
Outside of events, we're probably getting that version of him with a bunch of Normal Monster deck support. and Maybe Darkness Dragon.
I was hoping he'd get added to the game earlier then this (at the time of this post.1/19/2018)
Considering the stuff we might get may give Red-Eyes a second wind. Then again, The Zane event barely gave us anything that was really note worthy enough to build a CD deck outside of Repair plant and Over Dragon. So who knows.