As someone who has a 5/65 Aegon, I highly recommend using the gem on him. That said you need to have a decent amount of sig stones since at sig 1 he only retains 10% of his combo. Mine is currently sig 102 and at 56.7%. So he scales rather slowly, but it's super important
Aegon, if he is your main attacker in LoL, will likely have 999 hits stored by the time you reach electro. At that point, your hits are basically unblockable and electro can only shock you when you don't crit against him, which is maybe 8-10 times in the entire fight.
At the moment aegon is probably the best LoL champ and he can solo each and every fight. There are videos showing solos of all the difficult fights. So yeah he's the one to go with if LoL is on your mind. He should also come in handy in future quests considering that health pool of champs are constantly increasing giving him easy way to build up on his combo meter. Good luck.
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The answer is clear.
Aegon stomps electro if you get his combo up before the fight
https://youtu.be/WeFHVIG_RAk
If you can't, Gwenpool's not going to help much either.
Depends on your play style, who else do you have to use aside from gwen and aegon?