Organic ferromagnets with spin radicals combine the advantages of organic materials and magnetic materials, which are promising in the design of flexible organic spintronic devices. However, the presence of spin radicals makes the charge and spin properties of excitations different from those in normal organic materials. Based on the extended Su-Schrieffer-Heeger model including electron hopping, electron-lattice coupling and electron-electron interactions, we investigate charge and spin properties of solitons in finite quasi-one-dimensional organic ferromagnets with fixed-end boundary condition. The results demonstrate that the energy levels and spin density of the soliton depend on the hanging mode of the radicals on the main chain. When the radicals hang on the even-number sites of the main chain, the soliton state is localized only on odd-number sites of the main chain. Two shallow soliton levels appear in the band gap, and the preferential spin of the soliton is the same as that of the radicals. In contrast, when the radicals hang on the odd-number sites of the main chain, the soliton state distributes in both the main chain and radicals, where four shallow soliton levels emerge in the band gap. The preferential spin of the soliton is opposite to the radical spin. By analyzing the probability density of the soliton state, the mechanism of these phenomena is explained as the different interactions between the soliton state and radicals under different hanging modes of radicals, where the disturbance to the solitons from the antiferromagnetic spin density differs. The effect of different electron-electron interactions for the main chain and radicals are also discussed, where charge transfer between the main chain and radicals occurs and thus makes the charge density of the soliton nonzero. The work reveals the unique charge and spin properties of soliton excitations in organic magnets, which will be helpful for further design of organic spintronic devices.