They cycle out, just update online again and maybe a lower level one will come. Also, they don't do anything, there's no negative benefit to having them around, just the xp/jp/pg from fighting them as a reward.
The lesson we're taught as kids that reacting badly to being bullied is worse than actually being bullied is one of the most damaging psychological things we do to our kids, and is probably the root of a bunch of my mental health problems as an adult.
So whilst the instinct is totally "you should be the bigger person" it's important to realise that's only because we were told that when we were young, and it is not a value that is beyond questioning.
If you've never played Persona, make sure to get P3P for PSP as well! Disgaea also has a PSV game that I'm told is very good? There's lots of RPGs that have come over from the PSP on the store, too, so that's where I'd look to pick some up.
The ending in ACII is too good. And for whatever mechanics and polish that were improved in Brotherhood, II just had a more cohesive whole, and also came first so has that on it's side - which I think does matter.
Mass Effect 2 had polish and slickness, but the sheer sense of discovery in Mass Effect 1 is unrivalled. There's nothing in 2 that comes CLOSE to the first Citadel section in ME1, landing on it, walking around, being space cop. And also, removing the Mako/exploration may have removed a clunky part of the game, but it made the galaxy feel tiny.