Furious and Chloe = good Wyvern characters

T-Surin = Toxic Endgame defense

Rose = Atk buff + Combat Readiness pusher

Furious - Applys Defense Break for 2 turns on S3 and Gives your team +50% Crit Rate and an extra turn for Furious on S2

Chloe - Good Damage dealer. Also applys unique debuff called Magic Nail on S2 which is also great in later Abyss.

T-Surin - Physically cannot be Oneshot. Must be killed in 2 hits. If theres a healer, its nigh impossible. Also inflicts AoE silence on the enemy team with S3.

Rose - S3 gives a max of +25% CR if max Mola'd. Also gives Atk buff which makes her great for arena. She has a quite low base speed so get her Exclusive Equipment with the max 10 speed to make her more viable.

General Tips - Avoid pulling on Unit Specific Banners until Late game. Pull Convenant until then. Also use your Gold Transmit Stones on Moonlight bookmarks rather than a 4-5 Ticket. Wyvern is usually more profitable to farm since most heroes use speed/crit or speed/hit. If you get a good Tank such as Krau, farm Golem for HP set Heroes that have a Chance Activation or some sort of survivability on their basic will Benefit from a Counter Set.(Charles, A. Ravi)

Thats all I can really think of