Terraria has a item which any touhou fan would find similar to Marisa's master spark, that item is the Last Prism look at gameplay footage of the Last Prism and you will instantly notice the similarity between the Mini-Hakero and the Last Prism (sos spelling)
Maybe after defeating the Moon Lord (The final boss of Terraria which is OP on expert mode and drops the Last Prism in a 1/3 chance) you could summon Marisa in someway (I.E Yukari's Gaps)
Imagine how epic it would look for two people using L.ight A.mplification of S.imulated E.mitions of R.adiation at the same time!
Edit: Bet yall learnt something new!