Jiren is already an incredible unit both offensively and defensively. He boasts a huge ATK stat and his Passive is also very useful for certain game modes.
How to Get
[ JP version only]
Stats
Lvl
HP
ATK
DEF
1
1,781
2,181
1,240
100
7,635
9,170
5,283
Hidden Potential
Additional Routes
HP
ATK
DEF
Locked
9,635
11,170
7,283
Unlocked (Max)
12,635
14,570
9,883
Super ATK
Power Impact
Causes immense damage to enemy and greatly lowers DEF.
12 Ki Multiplier
Ki Meter
150
can be farmed to raise Super Attack
Skills
Leader Skill
"Universe Survival Saga" Category Ki +2 and HP, ATK & DEF +120% / Type Ki +2 and HP, ATK & DEF +40%
Passive Skill
ATK & DEF +120%; medium chance to stun all enemies
Lacking Prepared for Battle is kind of an issue, Jiren only has Shocking Speed as a common Ki link so he will usually struggle to get to 12 Ki without support and he will likely throw off the balance of the team if kept on rotation, just like [Hidden Power Unleashed] Ultimate Gohan. On this team there are very few options in terms of units that can activate his best links, the only ones worth mentioning are [Warrior of Freedom] Toppo and The Spirited Golden Warrior Super Saiyan Gohan (Teen), both support units that would not end up on rotation either way. Ideally you would want to have Jiren as a floater, but you could keep him on rotation in Super Battle Road in order to give his Passive more chances to activate.
On his own category team Jiren is a main rotation unit, he has no trouble being consistent thanks to the Tournament of Power link and he can be either paired with Goku (Ultra Instinct - Sign-) or with Kale Berserk/SS2 Caulifla/Kefla depending on who you have.
Super ATK
Jiren's Super Attack is pretty standard, immense damage a lowers enemy's DEF. The 12 Ki multiplier is also the standard 150%, same as Goku (Ultra Instinct -Sign-)'s.
Leader Skill
Jiren's Leader Skill is incomplete, as of now it gives his category 2 Ki and 120% to all stats with the addition of a mini Leader Skill for STR type.
Passive Skill
Jiren has a very good Passive already, a 120% boost to both ATK and DEF is the same Unparalleled Golden Ki Super Vegito gets and he is not even awakened yet. In addition to this Jiren also has a medium chance, around 33%, to stun the enemies at the start of turn.
Link Skill
Jiren notably lacks Prepared for Battle, which would have been useful for Super STR, and does not really have anything that makes up for that aside from Tournament of Power, which is basically useful just on his own team. Hero of Justice is a very powerful link, but it's difficult to activate and Infighter and Cold Judgment are also very niche links. This unit's links are not bad overall, but they are definitely underwhelming.
Toppo is a very good support unit and the best partner of Jiren. Sharing both "Tournament of Power" and "Shocking Speed" can guarantee Jiren an automatic Super Attack under a 3 Ki Leader Skill; in addition to this Toppo can also activate "Hero of Justice" and add a 30% ATK and DEF boost with his Passive for Jiren.
This SS Gohan (Teen) is a unit obtainable from the World Tournament GSSR banner, he is an amazing support unit that offers 2 Ki and 25% ATK & DEF to all Super types and can also activate "Hero of Justice" for Jiren.
Jiren and Goku (Ultra Instinct - Sign-) share "Tournament of Power" and activate "Godly Power" for each other. When Jiren will awaken "Fierce Battle" will also be added to the links shared.
Hidden Potential
Jiren is a STR type, meaning his best investment is going to be lv.20 Critical and lv.6 Additional. Thanks to the huge DEF boost this unit receives from his Passive, no Dodge is needed at all.
Should I use Elder Kais/Grand Kais?
There is no need to rush and max out this unit's Super Attack, other images of Jiren were recently shown with a different art, so it's likely that he is going to be a farmable character either from a Story Event or from his own Dokkan Event. Jiren is already worth 9 Kais, but I would advise to wait and see.