He gets a Staff that controls time
Gameplay wise:
He can throw out projectiles that open up and make everything in a radius Super slow mo. throwing out a second one will cancel the first one making the second one
He can record himself doing things then go back in time to set it, the recording will basically be him doing said task exactly how he did it. (so he could record himself fighting, say daxter and then go back in time to set the clone recording to fight him, while the original can do something else......most likely sandwhich him or slow down daxter)
And melee attacks
Plot wise:
Spoiler, click to toggle visibilty
Ratchet was attacked from behind with a lethal attack in crack in time and clank with his power of friendship went "fuck responsibility" and reversed time exactly to sort out the mistake...
He's become a mary sue
Again, gameplay wise for jak. he can't use weapons when in either eco form unless from glitch. When he heals time freezes completely and he uses all of the light eco energy he had. it's not something he can multitask with
its never used in plot
Groovatron literally makes you vulnerable if you're not ratchet and clank, Stopping all enemies and allies for a limited time while ratchet shoots/ takes cover. not something jak can power through
Black hole gun is an instant kill to all human sized enemies, he can use it 5 times. Shooting multiple black holes close together makes the black hole bigger. I can't remember what it did when fully leveled up
Jak has some things at his disposal but.... just like bayo vs dante, everything jak has, ratchet has as well/ more of
also zurkon family is indestructable, only way for them to go away is from them running out of ammo (THEM running out of ammo, not you running out. When they go you can just bring them out again. it's mad OP)
All and all, Ratchet gets a new bunch of weapons in each title with very very little being passed on over for upgrades and shit. I don't remember every gun and gimmick power they have along side the fully leveled up version that adds a new power/gimmick entirely but it's more than enough at disposal
Example, Ratchet has gravity boots( a step up from his magnet ones) that can counter the peacemaker's 1st upgrade.
Pluuuuuuuuuuuuus
Spoiler, click to toggle visibilty
Ricocheting shuriken, that can home in when leveled up
Clank (optional, doubt it'd be brought up) being able to go ratchet sized to help
underwater mobility(doubt it'd also be brought up)
10 canon years of experience (started of 15 in the first ps2 game and in nexus was 25 and a lot more mature than before.)
extra Durability to environmental attacks. Jak dies instantly touching lava/dark eco while ratchet will take a couple hits before dying
Swing shot(doubt it'd be used)
better aim(no recoil when shooting anything), and acrobatics
experience in hacking and puzzles(jak only has the latter)
Experience in engineering (jak had green haired babe to do that)
I'm not ripping on jak and daxter, i've played all of both franchises games aside from secret agent clank
but if we're counting dark daxter, thats all daxter has against clank
i'd much prefer him fight someone like samus or master chief since this is one sided to a whole new level
p.s. Jak isn't invincible anymore in his eco forms(it was removed after jak 2)