SP Toppo (Blue)

For the Rival Universe Tag, Toppo is almost a Team by himself. His 60% total Sustained Damage cut on Cover Change is excellent, and when he finishes getting scratched by his Foe, his Inflicted Damage Buffs will finish at 125%.

This is derived from his 20% Support Buff for Rival Universe allies that triggers after sustaining Damage, his initial 50% Damage Inflicted Buff, his personal Buff after taking Damage, and his Buff that activates when he faces an enemy. 

Despite not having massive offensive stats, he is a juggernaut because of this Buff combination. The -5 to All Arts cost effect he grants himself when taking hits, his 30% Buff to his own Damage when he activates his Main Ability, and his Special Arts Card's 20% Strike Damage buff for all allies combines to create a brutal monster that can take hits and dish damage back tenfold. 

Obviously Toppo's Damage is a major part of his kit, but it's not the only thing that defines him. The majority of the Buffs he grants himself are Team-wide Support Buffs that do as much for his allies as they do for him. His Main Ability's 5 Substitution Count Reduction and his outrageous Defense makes him a near-perfect partner for any Offensive Rival Universe character. 

After taking just one hit, his entire team's inflicted Damage is buffed by 25%, and then it's buffed again by 30% via his Main Ability, and its strike damage is buffed by 20% via his special arts card. These Buffs are not quick to expire either, as they're all staying in play for over 20 Timer Counts, ensuring that they'll make an impact.

Toppo's Damage support can reach outrageous numbers very quickly, and it's why facing him with Fighters that cannot eliminate him in a combo or two can lead to a devastating turnaround in an instant.

Unfortunately, it will almost always take significantly more time to bring him down - Toppo's ridiculous bulk affords him a charge of Endurance - bringing the crusader of justice back from the brink and restoring his health by 30% once only.

Toppo's Main Ability's Ultimate Arts card might be the most influential thing he can contribute to his Team, which should sound insane given how much he's already providing. The Justice Tornado is a massively powerful Card which inflicts No Switching on all enemies for 3 counts - just enough time to crush a problematic foe. 

This effect comes with a sinister bonus - a 30% Strike Damage received Debuff on all enemies for 30 Timer Counts when making contact. A debuff this deadly is almost too crippling to come back from when its combined with all of the Support Toppo is giving his teammates.