The odd-proton $^{141}\mathrm{Eu}$ nucleus is studied with the $^{110}\mathrm{Cd}$${(}^{35}$Cl,2p2n\ensuremath{\gamma}) reaction populating states in seven distinct bands. For the yrast band, high spin states are followed up to ${\mathit{I}}^{\mathrm{\ensuremath{\pi}}}$=43/${2}^{\mathrm{\ensuremath{-}}}$ and a band crossing, due to the alignment of the second and third ${\mathit{h}}_{11/2}$ protons, is observed at a rotational frequency \ensuremath{\Elzxh}${\mathrm{\ensuremath{\omega}}}_{\mathit{c}}$=0.37 MeV. For the positive-parity bands, only the three-quasiparticle configuration, namely, \ensuremath{\pi}${\mathit{g}}_{7/2}$\ensuremath{\bigotimes}[\ensuremath{\pi}${\mathit{h}}_{11/2}$${]}^{2}$, is observed up to high spins. In addition, two \ensuremath{\Delta}I=1 bands with no E2 crossovers are found in this nucleus. The cause of the relatively strong M1 transition bands can be explained by a drastic shape change due to the alignment of an ${\mathit{h}}_{11/2}$ neutron pair. A systematic comparison amongst the N=78 isotones, $^{137}\mathrm{Pr}$, $^{139}\mathrm{Pm}$, and $^{141}\mathrm{Eu}$, is made.