While not as formidable as his first appearance in the anime, EX 2F Cell BLU is only looking out for himself and hold no allegiance to any major Tag.
He was to deal decent Damage against Saiyans and most Androids, but this was heavily balanced by power creep
As of the third balance update, this Fighters stats and toolkit were improved, but he's still too weak to qualify for the core of any Team
Dual Stat Z-Ability
A Strike-centric Meta often means that Blast Defense Ability Bonuses are in low demand.
While this won’t be enough to overthrow Strike Fighters, two stat Buffs regardless of stars gives EX 2F Cell BLU a much longer shelf life.
Her Main Ability significantly raises the opponent’s Team ki cost of both Strike and Blast cards for 20 timer counts. While it can seem harmless, this Effect practically reduces the duration of enemies’ Combos, so it can be seen as a good Defensive Boost for the Team.
This Fighter inflicts increased Damage to both Saiyan and Androids, however neither Anti-Tag Unique Ability is particularly great. In fact, those small Boosts are not enough for him to be a meaningful Offensive Fighter, considering his low stats. For an EX Fighter, it would be better to have a single but powerful Anti-Tag Unique Ability, considering they are already supposed to be situational options.
Blue Color Counter
This Fighter is perfect for the bench of this Team, however his role won’t ever be higher than that.
Power creep and an inability to grind makes him less viable.
While his stats were Buffed with the third balance update, this wasn’t quite enough to bring him up to average.
EX 2nd Form Cell BLU shares many similarities to his more perfect self, SP PF Cell RED in that they are both Ranged Fighters and provide debuffs to Enemy Arts Card costs. He counters the more common Saiyan Tag, but it’s unlikely that he will see the core line-up often.