Studynot:
In reply to engine (msg # 15):
yeah, I never played 4th edition, skipped it entirely, so if you guys go that route I'd bow out due to not having enough time to learn the rules.
3.5/PF or 5e I can do easily, but 4th Edition would take too much reading. Though it does look like a good d20 system for this concept.
I don't imagine for a moment that anyone would really use 4th Edition for this. There's too much blind hatred of it. The lack of open-license material for it doesn't help with that.
Studynot:
Rogue would still be really hard, even in an "inspired by" way. Maybe Hexblade Warlock/monk or something for flight and "strength" based fighting unarmed like Rogue does. Stealing abilities is nigh impossible without homebrew.
Another nice thing about 4th Edition is how much reflavoring it encourages. A star-pact warlock might be good for Rogue; it doesn't enable the character to "steal abilities" but it can grant frequent generalized bonuses to the character, which could be narrated as boosts stemming from temporary contact.
There are also classes that let allies make attacks, or which force enemies to make attacks on themselves. Those could be reflavored as the character themselves making the attack i.e. utilizing another's ability.
A battlemind can turn enemy's attack directly back on them and allows for some temporary changes of form, which could be flavored as taking on another's traits.