Rank 1: Sinister
Sinister Proto-Drage

Gladiator: Legion S6,7
Gladiator: BfA S1
Demonic Storm Dragon
Dominant Storm Dragon
Dread Proto-Drake
Elite Sets
Mage Tower

504 Mounts
Son of Galleon
100+ Exalted Reps
38 Collected Sets
10 lvl-120 Alts

516 Mounts
MoP CM/WoD CM
All Mage Towers
Full Tier 3 War/Pala
Big Love Rocket
1166 Pets, 556 Toys
100+ Exalted
Vanilla Unobtainables
Loads of Transmog

Cruel Gladiator: Legion Season 3
Gladiator: Legion Seasons 3,5

27k AP earned by char
MoP CM
All Mage Towers
S16 Elite Set
Conqueror of Ulduar
The Chosen
Primal Victory Enchant

Full Primal S16 Elite Set
Mage Tower: Arms, Fury

Gladiator: Season 13, 14
Achievements
Rarest mounts
Elite warlock Sets
Grievous Gladiator's Cloud Serpent (Unobtainable)
Tyrannical Gladiator's Cloud Serpent (Unobtainable)

8 lvl-120 Characters
437 Mounts
Big Love Rocket
Elite Sets
80+ Reps: Exalted

R1 Gladiator: BfA S1
Gladiator: Legion S6
Gladiator: WoD S3 
Gladiator: BfA S1/2 
Glorious Tyranny 
Primal Victory

R1 Gladiator: Legion S2
Gladiator: Legion S2
Gladiator: BfA S1  
All Legion Elite Sets
Elite PvP Tabards: Demonic, Cruel, Dread

Legion S2 Gladiator
Legion S1/2, S5/6/7 Elite Sets
First Satyr's Spaulders