I always envisioned Suzaku teaching Lelouch Japanese shortly after he arrived in Japan, and that Suzaku spoke English. I assume now he's totally fluent in Japanese, although, it's interesting because you would think he would still have an accent (and hence, Zero would too). As for Chinese, it is possible Lelouch might have received some background in it growing up. Nobility probably has to learn important languages, and given the size of the Chinese Federation, it's probably necessary for diplomacy.
Otherwise, I try not to think too hard about it since the show is written in Japanese, and "everyone speaks Japanese" tends to come up in other anime XD
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Otherwise, I try not to think too hard about it since the show is written in Japanese, and "everyone speaks Japanese" tends to come up in other anime XD