PSA: If there's a Karthus on your team, PLEASE let him farm.
it doesn't entirely matter if I'm ahead, behind or whatever, If I'm currently in lane as a Karthus player, LET ME HAVE MY FARM, especially if I managed to shove my lane opponent out of my lane. If the opponent goes MIA I'll ping the best I can and if he DOES show up bot or top, I'll ult where/when necessary, but PLEASE don't start showing up in my lane unless it's 3-5 man mid or something like that.
I NEED that farm because:
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It's not very often I get a matchup where I can play super aggressive in lane unless I'm Top maybe, so I'll have to play passively and get CS for my items
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More often than not, our Jungler has already gotten Wolves/chickens/Gromp/Krugs, which means I can't just take it whenever I want. the Jungler needs those just as much as the kills he might get off of ganking.
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The more CS I get, the more Items I can buy. The more items I buy, the stronger my ult can get when their jungler decides to show up bot/top and there might be an opportunity to ult to at least get an assist, less a kill. It's essentially a win/win here. (unless something happens, like someone chases singed or something like that lol)
I'm just saying, while Karthus is more suited as a "Team Deathmatch/Objective taking" type of mentality, Karthus's strongest ability is to get CS over kills to become the late game monster that he is. So, when you do decide to gank mid or top or whatever, please let Karthus take the farm from his lane. Unless I'm dead or at base or something, in which that case, go right ahead :P

pre 6/sheen/triforce

farm and he will give you elo.