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What is will in Japanese?
It depends on what you mean by "will". If you mean the noun will, then it's ishi (意志). If you mean the will that indicates future tense in English, then there isn't one.… The normal present tense form of the verb can mean "subject verbs" and it can mean "subject will verb". Whether the verb is present or future is indicated by context. Some sentence endings always indicate future, others do only sometimes. One ending that almost always means indicates future tense is deshou (でしょう), not to mention it's plain equivalent darou (だろう). Deshou meant originally something like would or shall, but is now used mostly like probably. In modern Japanese, when deshou follows a plain verb (that is, when it's not used as the main verb), it means that the verb should be taken to be future tense, since you can't make definite statements about the future, which is unknowable (at least, that's the simple reason). Another way to indicate the future tense is to use a verb conjugation that is similar to deshou, the -mashou form (or the equivalent plain verb -ou/-you form). That from usually means "let's verb", but in questions means "shall we verb?". It can also mean shall, but the use is very archaic and authoratative sounding. Long story short: option 1) do nothing, just use the verb option 2) add deshou option 3) use the extremely formal -mashou form (MORE)
